content string | books_score float64 |
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Mexican America - Introduction
"Mexican America" is a sampling of objects from the collections of the National Museum of American History. The stories behind these objects reflect the history of the Mexican presence in the United States. They illustrate a fundamentally American story about the centuries-old encounter b... | 0.406069 |
Uveitis is inflammation of the uvea, which is made up of the iris, ciliary body and choroid. Together, these form the middle layer of the eye between the retina and the sclera (white of the eye).
The eye is shaped like a tennis ball, with three different layers of tissue surrounding the central gel-filled cavity, which... | 0.764701 |
Marion Levine teaches English, Literature and Film Production at Los Angeles Center for Enriched Studies, Los Angeles, CA
Measure for Measure, Act 4 or 5
What's On for Today and Why
Students will choose a character from Measure for Measure and create a "back story" for that character. This will encourage students to re... | 0.546011 |
Science Fair Project Encyclopedia
The chloride ion is formed when the element chlorine picks up one electron to form the anion (negatively charged ion) Cl−. The salts of hydrochloric acid HCl contain chloride ions and are also called chlorides. An example is table salt, which is sodium chloride with the chemical formul... | 0.880625 |
Fun Classroom Activities
The 20 enjoyable, interactive classroom activities that are included will help your students understand the text in amusing ways. Fun Classroom Activities include group projects, games, critical thinking activities, brainstorming sessions, writing poems, drawing or sketching, and more that will... | 0.473391 |
by I. Peterson
Unlike an ordinary, incandescent bulb, a laser produces light of a single wavelength. Moreover, the emitted light waves are coherent, meaning that all of the energy peaks and troughs are precisely in step.
Now, a team at the Massachusetts Institute of Technology has demonstrated experimentally that a clo... | 0.480218 |
The Solar and Heliospheric Observatory (SOHO) spacecraft is expected to discover its 1,000TH comet this summer.
The SOHO spacecraft is a joint effort between NASA and the European Space Agency. It has accounted for approximately one-half of all comet discoveries with computed orbits in the history of astronomy.
"Before... | 0.369433 |
Teaching Strategies: Effective Discussion Leading
While lecturing is a fast and direct way to communicate a body of knowledge, discussion encourages students to discover solutions for themselves and to develop their critical thinking abilities. They learn how to generate ideas, consider relevant issues, evaluate soluti... | 0.574622 |
The knowledge, skills and understandings relating to students’ writing have been drawn from the Statements of Learning for English (MCEECDYA 2005).
Students are taught to write a variety of forms of writing at school. The three main forms of writing (also called genres or text types) that are taught are narrative writi... | 0.601033 |
Filed under: Foundational Hand
After studying the proportions of the Foundational Hand letters, the next step is to start writing the letters.
Each letter is constructed rather than written. The letters are made up of a combination of pen strokes, which are only made in a top – down or left – right direction. The pen i... | 0.56251 |
In mathematics, hyperbolic functions are analogs of the ordinary trigonometric, or circular, functions. The basic hyperbolic functions are the hyperbolic sine "sinh" (typically pronounced /ˈsɪntʃ/ or /ˈʃaɪn/), and the hyperbolic cosine "cosh" (typically pronounced /ˈkɒʃ/), from which are derived the hyperbolic tangent ... | 0.728602 |
Surface area is a two-dimensional property of a three-dimensional figure. Cones are similar to pyramids, except they have a circular base instead of a polygonal base. Therefore, the surface area of a cone is equal to the sum of the circular base area and the lateral surface area, calculated by multiplying half of the c... | 0.509274 |
In this lecture you will learn how to undertake Solving Quadratic Systems. First you will start with Linear Quadratic Systems as well as their Solutions, before you move into Quadratic Quadratic Systems and their Solutions. Lastly, you will learn how to solve Systems of Quadratic Inequalities.
linear-quadratic system, ... | 0.964791 |
An earthquake is a sudden vibration or trembling in the Earth. More than 150,000 tremors strong enough to be felt by humans occur each year worldwide (see Chance of an Earthquake). Earthquake motion is caused by the quick release of stored potential energy into the kinetic energy of motion. Most earthquakes are produce... | 0.713507 |
In 2006, high sea temperatures caused severe coral bleaching in the Keppell Islands, in the southern part of the reef — the largest coral reef system in the world. The damaged reefs were then covered by a single species of seaweed which threatened to suffocate the coral and cause further loss.
A "lucky combination" of ... | 0.44666 |
During this tutorial you will be asked to perform calculations involving trigonometric functiions. You will need a calulator to proceed.
| The purpose of this tutorial
is to review with you the elementary properties of the trigonometric functions.
Facility with this subject is essential to success in all branches of sc... | 0.937322 |
Is there such a thing as too much money?
by Fred E. Foldvary, Senior EditorWhat is inflation? There are two economic meanings of inflation. The first meaning is monetary inflation, having to do with the money supply. To understand that, we need to understand that the impact of money on the economy depends not just on t... | 0.331602 |
There are many techniques available to help students get started with a
piece of writing. Getting started can be hard for all levels of writers.
Freewriting is one great technique to build fluency. That was
explored in an earlier lesson plan: http://www.thirteen.org/edonline/adulted/lessons/lesson18.html
This unit offe... | 0.700029 |
Chandra "Hears" a Supermassive Black Hole in Perseus
A 53-hour Chandra observation of the central region of the Perseus galaxy cluster (left) has revealed wavelike features (right) that appear to be sound waves. The features were discovered by using a special image-processing technique to bring out subtle changes in br... | 0.427335 |
SL Psychology/Intro to Research Methods
The following items should be included in this section: The Hypothetico-deductive (scientific)method, types of psychological research methods, research designs, sampling, reliability, validity, and triangulation.
Research into mind can be traced back to Ancient Greece. However, e... | 0.460547 |
|U.S. Naval Observatory||Earth Orientation Department|
In 1956, following several years of work, two astronomers at the U. S. Naval Observatory (USNO) and two astronomers at the National Physical Laboratory (Teddington, England) determined the relationship between the frequency of the Cesium atom (the standard of time)... | 0.485667 |
The Savage Islands, or Ilhas Selvagens in Portuguese, are a small archipelago in the eastern North Atlantic Ocean between the archipelago of Madeira to the north and the Canary Islands to the south. Like these other island groups, the Savage Islands are thought to have been produced by volcanism related to a mantle plu... | 0.569822 |
- Hypothermia occurs when the body's core temperature drops below 37°C.
- This typically results from prolonged exposure to cold conditions, especially in damp, wet or snowy weather.
- Early signs: shivering; listlessness; cold, pale, puffy face; impaired speech and impaired judgment.
- Later signs: drowsiness, weaknes... | 0.354843 |
Most common smoke detectors (Fig. 13-2) contain a small amount of 241Am, a radioactive isotope. 241Am is produced and recovered from nuclear reactors. Alpha particles emitted by the decays of 241Am ionize the air (split the air molecules into electrons and positive ions) and generate a small current of electricity that... | 0.80581 |
Lesson Plans and Worksheets
Browse by Subject
Blood Teacher Resources
Find teacher approved Blood educational resource ideas and activities
A series of diagrams and photographs is a vivid tool for delivering a lesson about blood vessels. Each slide has notes for the lecturer to use to explain each slide. Your young bio... | 0.74993 |
Teacher's Resources - A Question of Ritual
For the people of the ancient Americas as for many other humans worldwide, ceremonies formed a bridge between their world and that of deities and spirits. Through sacred rituals they communicated to their gods and ancestors their hopes for a bounty of food, protection from the... | 0.374542 |
Evidence from caves in Siberia indicates that a global temperature increase of 1.5° Celsius may cause substantial thawing of a large tract of permanently frozen soil in Siberia. The thawing of this soil, known as permafrost, could have serious consequences for further changes in the climate.
Permafrost regions cover 24... | 0.481386 |
Storytelling in the Classroom
Storytelling is not the same as reading aloud because it requires greater interaction between the teller and the listener. Therefore, storytelling is a great tool for improving children's communication skills, as well as developing language skills, comprehension, and self-awareness. (Readi... | 0.450481 |
Discussion about a core curriculum brings to light some fundamental differences in thinking about education and learning.
A core curriculum is a set of educational goals that focuses on making sure that all students using it will learn set material tied to age/grade level. The design of the curricula are based on thing... | 0.455852 |
Lamp Shell Terebratulina septentrionalis
It would be easy to mistake a lamp shell for a small bivalve mollusk, as both have a hinged shell in two parts and live attached to the sea floor. Lamp shells, however, have a very thin, light shell and the two parts are different sizes, with the smaller one fitting into the lar... | 0.364075 |
In neuroanatomy, a sulcus (Latin: "furrow", pl. sulci) is a depression or fissure in the surface of the brain.
It surrounds the gyri, creating the characteristic appearance of the brain in humans and other large mammals.
Large furrows (sulci) that divide the brain into lobes are often called fissures. The large furrow ... | 0.492433 |
How to Enter Basic Formulas in Excel 2007
As entries go in Excel 2007, formulas are the real workhorses of the worksheet. If you set up a formula properly, it computes the right answer when you first enter it into a cell. From then on, it keeps itself up to date, recalculating the results whenever you change any of the... | 0.784304 |
Trilobite Olenoides erratus. Source: Mark A.Wilson A fossil is the preserved remain of a lifeform that lived in prehistoric times. Most commonly fossils are mineralized parts or a whole organism which is no longer alive. In other cases the fossil may contain actual remains of the dead organism; in particular, DNA may b... | 0.557012 |
Mars has a striking red appearance, and in its most favorable position for viewing, when it is opposite the sun, it is twice as bright as Sirius, the brightest star. Mars has a diameter of 4,200 mi (6,800 km), just over half the diameter of the earth, and its mass is only 11% of the earth's mass. The planet has a very ... | 0.316602 |
Classification of Nouns
Nouns are categorized by vowels and consonants they include. For the consonants they include nouns are categorized in two groups: 15 Nouns and 16 Nouns. For the vowels they include nouns are categorized in 5 groups: a, ä; å, ø; o, ö; u, y; i, e.
15 Nouns: the first consonant of these nouns are h... | 0.748592 |
Far north within the Arctic Circle off the northern coast of Norway lies a small chain of islands known as Svalbard. These craggy islands have been scoured into shape by ice and sea. The effect of glacial activity can be seen in this image of the northern tip of the island of Spitsbergen. Here, glaciers have carved out... | 0.464159 |
ExploraTour - How to Build a Star
"But wait a minute," you say. "We've tried this nuclear fusion stuff on Earth to produce energy and so far it hasn't worked very well. How does the sun succeed where we have failed?"
You are right. Operational nuclear power plants on Earth use fission reactions to produce power. They w... | 0.692274 |
After participating in this activity, students will be able to:
- Describe the difference between herbivores, carnivores, and producers.
- Answer questions about the interdependence of herbivores, carnivores, and producers as members of a food chain.
- Answer questions about how pollution affects food chains.
All livin... | 0.839115 |
Formatting marks in a Word document.
Imagine that you have typed a few paragraphs. The paragraphs seem very far apart, and the second paragraph starts farther to the right than the first paragraph.
You can see what's going on in your document by looking at the formatting marks that Word automatically inserts as you typ... | 0.673926 |
From Ohio History Central
The Progressive Movement was a widespread reform effort to cure the many social and political ills in America after the advent of the Industrial Revolution.
During the late nineteenth and the early twentieth centuries, the United States of America underwent tremendous change. One of the princi... | 0.568223 |
stressArticle Free Pass
stress, in physical sciences and engineering, force per unit area within materials that arises from externally applied forces, uneven heating, or permanent deformation and that permits an accurate description and prediction of elastic, plastic, and fluid behaviour. A stress is expressed as a quo... | 0.77126 |
Hands-On Is Minds-On
Want to Engage Every Student? Break out the Old-Fashioned Scissors and Glue
Second-grade teacher Becky Hicks has learned that there is no substitute for activities that require kids to use their hands as well as their minds. During literacy hour in Hicks's class at Blanchard Elementary School in Ca... | 0.528866 |
The creation of dead zones begins when nitrogen and phosphorus from fertilizers used on land, and from raw or poorly treated sewage, wash into streams, into rivers, and to the sea. Thus fertilized, single celled drifting algae in the sea reproduce – bloom — until they reach abnormal densities.
The algae subsequently di... | 0.500877 |
||This article needs additional citations for verification. (March 2011)|
Nuclear meltdown is an informal term for a severe nuclear reactor accident that results in core damage from overheating. The term is not officially defined by the International Atomic Energy Agency or by the U.S. Nuclear Regulatory Commission. Ho... | 0.330201 |
Analog Input Channels
Temperature is a measure of the average kinetic energy of the particles in a sample of matter expressed in units of degrees on a standard scale. You can measure temperature in many different ways that vary in equipment cost and accuracy. The most common types of sensors are thermocouples, RTDs, an... | 0.843109 |
Mystery Strategy for Elementary Students
Using the premise of a mystery to solve, elementary students act as history detectives as they explore a historical question and analyze carefully chosen clues to formulate and test hypotheses.
This strategy depends on our need to solve mysteries. Students are given an opportuni... | 0.535333 |
backward and forward both run to need may they ,faster run to are computers If
A Turing machine is fine for reasoning about computers, but it's not
an ideal model for building them. Some more practical components of
reversible logic were introduced in the 1980s by Edward F. Fredkin
and Tommaso Toffoli, who were then wo... | 0.476055 |
Using climatic trends for sustainable agriculture
This activity provides opportunities for students to:
- consider the value of weather and climate information to inform management practices
- propose management strategies for resources based on these predictions
- use the Internet as a source of up-to-date information... | 0.347858 |
What does this program measure?
Sulfur Dioxide is measured at 4,10,23,and 40 meters above the ground, in units of parts per trillion by volume.
How does this program work?
Why is this research important?
This is part of an effort to monitor long-term of emissions from Kilauea and Mauna Loa volcanoes. It may provide a p... | 0.45486 |
What causes Tsunamis?
Tsunami are waves caused by sudden movement of the ocean due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.
Most tsunami are caused by large earthquakes on the seafloor when slabs of rock move past each other su... | 0.662293 |
Temporal range: 0Ma Recent
|Range of Chinchilla lanigera and Chinchilla chinchilla.
Chinchillas are crepuscular rodents, slightly larger and more robust than ground squirrels, native to the Andes mountains in South America. They live in colonies at high altitudes (up to 15,000 ft/4,270 m). Historically, they lived in t... | 0.405723 |
The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass and 99% of its water vapor and aerosols. The average depth of the troposphere is approximately 17 km (11 mi) in the middle latitudes. It is deeper in the tropics, up to 20 km (12 mi), and shallower near t... | 0.568007 |
Contrary to popular belief, astronauts still have weight while they are orbiting the earth. In fact, Shuttle astronauts weigh almost as much in space as they do on the earth's surface. But these astronauts are in free fall, together with their ship, and their downward accelerations prevents them from measuring their we... | 0.389759 |
5th Grade Oral Language Resources
Students will:• Learn about the concept of whales.
• Access prior knowledge and build background about whales.
• Explore and apply the concept of whales.
Students will:• Demonstrate an understanding of the concept of whales.
• Orally use words that describe different types of whales an... | 0.478643 |
A visual arts lesson combined with language arts, where the students will create a visual poem using crayons. Students are asked to make a connection to an important aspect or event their lives.
Have you ever wondered why children are so afraid to express themselves through poetry? Possibly it is because they think a p... | 0.592505 |
The characteristics of plants give us clues as to how some plants are similar to and different from others. Classification of plant species depends upon common and unique features that are used to identify plants by their characteristics. Scientists and plant experts have collected data on numerous plant species from s... | 0.623557 |
Definition of Immunization
Immunization: Vaccination. Immunizations work by stimulating the immune system, the natural disease-fighting system of the body. The healthy immune system is able to recognize invading bacteria and viruses and produce substances (antibodies) to destroy or disable them. Immunizations prepare t... | 0.303324 |
A tsunami is a series of waves most commonly caused by violent movement of the sea floor. In some ways, it resembles the ripples radiating outward from the spot where stone has been thrown into the water, but a tsunami can occur on an enormous scale. Tsunamis are generated by any large, impulsive displacement of the se... | 0.761849 |
Science: Balls and Ramps
These resources explore basic concepts of science related to balls and ramps. Learn about the characteristics and properties of balls and ramps, relationship between the physical properties of balls and their motion, and some of the factors that affect the way balls behave. Includes lesson plan... | 0.676049 |
LEDs are commonly used in all kinds of applications. The tiny red and green indication lights found here and there on electronic equipment such as TVs and computers are LEDs. They are very efficient in converting an electric current directly into light, but their use was limited by technical constraints preventing the ... | 0.670824 |
Source: Garland Science/Taylor and Francis Books, Inc.
In this animation adapted from Garland Science Publishing, a detailed look at DNA reveals the structural features that make up the famed double-helix molecule. The animation shows how the ladder-shaped DNA is constructed from chemical building blocks, including pho... | 0.877679 |
|Module 3: Interpreting Data|
2. Using data to support an argument
To test a theory or answer a question a study is designed, sampling is conducted and the data is collected. The process of descriptive statistics then involves presenting the data in tables and graphs. The data may seem to indicate a clear conclusion ab... | 0.594756 |
Transformations in the Coordinate Plane
Transformations in the coordinate plane are often represented by "coordinate rules" of the form (x, y) --> (x', y'). This means a point whose coordinates are (x, y) gets mapped to another point whose coordinates are (x', y').
When possible, simple formulas are given for x' and y'... | 0.791748 |
General Chemistry/Periodicity and Electron Configurations
Blocks of the Periodic Table
The Periodic Table does more than just list the elements. The word periodic means that in each row, or period, there is a pattern of characteristics in the elements. This is because the elements are listed in part by their electron ... | 0.948789 |
Most Atlantic hurricanes start to take shape when thunderstorms along the west coast of Africa drift out over warm ocean waters that are at least 80 degrees Fahrenheit (27 degrees Celsius), where they encounter converging winds from around the equator.
Warm Air, Warm Water Make Conditions Right for Hurricanes
Hurricane... | 0.473188 |
We recognise that early childhood is key to young children’s development. By the age of 3 years 80% of their brain is developed and so it is important that the foundations of mathematical thinking, language and skills are supported from birth. So, how can we as practitioners (and parents) help children become confident... | 0.339067 |
Electrical inductance sensors are non-contact devices that measure the inductance of an electrical component or system. They consist of a wire loop or coils and are relatively inexpensive. Inductance, the property of a circuit or circuit element to oppose a change in current flow, refers to the capacity of a conductor ... | 0.569273 |
XII. This activity involves reading a scenario and discussing the correct way for a school bus driver to handle it. Options for using the scenarios can be found on page 5.
Follow these steps to conduct the activity.
- Review the instructions (XII.A-D) with the participants.
- Read the scenario slowly.
NOTE: There are 1... | 0.666682 |
Functions and Variables in Physical Science Experiments
Almost all true science experiments involve designing a series of trials where one variable is manipulated and another variable changes as a result of this manipulation. All other variables are held constant. A variable is said to be a function of another variable... | 0.756717 |
Photo: Scott Zona
There is nothing more emblematic of spring and summer than flowers, but why do plants have flowers, and how did they evolve?
Botanists know that flowering plants, that is, plants that reproduce by producing seeds, evolved from non-flowering plants. According to evolutionary theory, nature would have s... | 0.391727 |
Sunlight is Earth’s most abundant energy source and is delivered everywhere free of charge. Yet direct use of solar energy—that is, harnessing light’s energy content immediately rather than indirectly in fossil fuels or wind power—makes only a small contribution to humanity’s energy supply. In 2008, about 0.1% of the t... | 0.405925 |
NASA has released a computer visualization project called "Perpetual Ocean" that presents a data-created time lapse of the Earth's ocean and sea surface currents over a two-year period.
The animation (see below) shows the globe slowly spinning as white swirls curl and move in the water around landmasses. It looks as if... | 0.444289 |
Dinosaurs' active lifestyles suggest they were warm-blooded
H. Pontzer, V. Allen, J.R. Hutchinson/PLoS ONE
Whether dinosaurs were warm-blooded or cold-blooded has been a long-standing question in paleobiology. Now, new research on how two-legged dinosaurs walked and ran adds new evidence to the argument for warm-bloode... | 0.448063 |
Lesson plans for teaching organization
A collection of LEARN NC's lesson plans for teaching organization, the second of the five features of effective writing.
- Getting Paragraphing Down P.A.T.
- One way to remember when to indent and begin a new paragraph is when (P) the place changes, (A) the action changes, and (T)... | 0.663933 |
because accumulation exceeds ablation in a location. This
accumulation zone after it thickens to more than 30 m begins to
For a glacier to survive it must have a consistent and
persistent accumulation zone.
To diagnose a glacier
that is disappearing look for
1) Emergence of rock
outcrops in upper region of the glacier.... | 0.404037 |
Riparian and Wetland Management
Riparian areas are lands adjacent to creeks, streams, lakes, and rivers that support vegetation dependent upon free water in the soil. They are sometimes called "Ribbon-of-Green" because the vegetation on waterway banks forms a ribbon-like pattern when seen from the air. These areas, con... | 0.365531 |
In the cities and countryside section of Busy Teacher, there are 78 FREE worksheets to choose from
. They range from very simple word searches to detailed activities related to these topics. This activity
, for example, was created for Russian ESL learners but can serve as a model for you to create a similar activity m... | 0.589863 |
Free Blacks in the North and South, The Liberator, January 22, 1831
William Lloyd Garrison, a leading northern abolitionist, began publishing his anti-slavery newspaper, The Liberator, in January 1831. In this early article he compares the conditions of free blacks in the North and the South and the differences in the ... | 0.472829 |
Reading Skills: Making Connections
These sites provide various activities involving the reading stragey with connections to text-to-text, text-to-self, and text-to-world. Includes modeling scenarios as well as interactive activities for teachers.
Into The Book: Strategies for Learning
This site from Wisconsin Education... | 0.460549 |
A volcano is a hole where melted rock called magma or rock and ashes are
thrown up from inside the earth. Volcanoes are commonly known around the
world for bringing huge destruction as they erupt. When most people think
of volcanoes they think of hot boiling lava. Many people do not realize
that instead of only eruptin... | 0.583514 |
by Anne E. Egger, Ph.D.
We all see changes in the landscape around us, but your view of how fast things change is probably determined by where you live. If you live near the coast, you see daily, monthly, and yearly changes in the shape of the coastline. Deep in the interior of continents, change is less evident – rive... | 0.833883 |
Graph the Asymptote of a Tangent Function
An asymptote is a line that helps give direction to a graph of a trigonometry function. This line isn’t part of the function’s graph; rather, it helps determine the shape of the curve by showing where the curve tends toward being a straight line — somewhere out there. Asymptote... | 0.766584 |
This lesson introduces the concept of monopoly. It calls upon students to consider how monopoly power might affect the quality and price of goods and services offered to consumers. In light of what they learn about the history of trusts and the Sherman AntiTrust Act, the students write editorials, stating and explainin... | 0.833003 |
Rhenium is a rare, silvery-white metallic element. Its atomic number is 75 and its symbol is Re. Rhenium was discovered in 1925 by a team of German scientists named Walter Noddack, Ida Tacke-Noddack, and Otto Berg. They discovered rhenium as a trace element in platinum ores and the mineral columbite. It is very dense. ... | 0.426351 |
Chemical Principles/Will It React? An Introduction to Chemical Equilibrium
And so, nothing that to our world appears,
Perishes completely, for nature ever
Upbuilds one thing from another's ruin;
Suffering nothing yet to come to birth
But by another's death.
Lucretius (95-55 B.C.)
The main question asked in Chapter 2 wa... | 0.914333 |
The set of Hamming
codes are called 'Forward Error Correction
' and give the ability for the receiving station
to correct a transmission error
. While this takes more bits to send the information
, it means fewer retransmits and thus can actually speed up a noisy connection.
The number of parity bits in the hamming cod... | 0.437269 |
Note: This lesson was originally published on an older version of The Learning Network; the link to the related Times article will take you to a page on the old site.
Teaching ideas based on New York Times content.
Overview of Lesson Plan: In this lesson, students use prototypical fantasy themes to create an original r... | 0.438542 |
Autism spectrum disorders (ASDs) involve a wide range of clinical diagnoses, including
- Asperger syndrome (a mild form of autism)
- childhood degenerative disorder
- pervasive developmental disorder not otherwise specified (PDD-NOS)
Although the severity of the symptoms that occur with each of these disorders will be ... | 0.408365 |
In the simplest of terms, a virus is an infectious agent. It operates like a computer virus, replicating and dispersing itself in all directions, while crippling the normal function of the host. A virus has genes, but no cellular structure, so it's not considered a living organism. And like parasites, viruses can't sur... | 0.354954 |
This teacher-submitted, secondary lesson plan appeared in the Badger History Bulletin. Please adapt it to fit your students' needs.
Author: Joni Shahrani, Sennett Middle School, Madison
Students will investigate the meaning of "change" in our society and grasp the way Wisconsin's progressive traditions have affected ch... | 0.639107 |
In a typical year, it is not uncommon for a dozen or so comets to come within range of amateur telescopes. During the month of October, 2010, a small comet will pass unusually close to Earth. On Oct. 20, Comet Hartley 2 will pass just over 11 million miles (18 million km) from Earth. That is close enough for the comet ... | 0.489068 |
Concept 39 A genome is an entire set of genes.
Cross pure-bred pea plants to identify dominant flower color.
HI! One of the first steps in locating a disease gene is screening families with the disease for markers that are linked to the gene. Scientists use short tandem repeats (STR) as markers. These repeats can vary ... | 0.574947 |
Prefixes, Suffixes, Inflectional Endings, and Root Words
Spelling Words Correctly Using Prefixes This strategy will focus on the prefix "re-" to help predict the meaning of words. The same strategy can be used to introduce other common prefixes such as "dis-", "in-" and "im-".
Prefixes and Suffixes Students will create... | 0.688116 |
Although researchers can't be exactly sure how old the bacteria are — or how they reproduce — microbiologists at Aarhus University in Denmark posit that the ancient organisms could be anywhere from several thousand to millions of year old, The Washington Post's Joel Achenback reports.
The bacteria, found living in sedi... | 0.391689 |
The Age of Reason, as it was called, was spreading rapidly across Europe. In the late 17th century, scientists like Isaac Newton and writers like John Locke were challenging the old order. Newton's laws of gravity and motion described the world in terms of natural laws beyond any spiritual force. In the wake of politic... | 0.508678 |
The Array object is used to store multiple values in a single variable.
Create an array, and assign values to it:
You will find more examples at the bottom of this page.
An array is a special variable, which can hold more than one value at a time.
If you have a list of items (a list of car names, for example), storing ... | 0.567942 |
|Life depends on an essentially continuous exchange of
mass and energy between living organisms and their environment.
Human impact on this vital exchange has occurred on a global or
macroclimate scale. Understanding the physical principles
involved in heat transfer and absorption in the atmosphere is critical
to under... | 0.518894 |
Introduction to Enzymes
The following has been excerpted from a very popular Worthington publication which was originally published in 1972 as the Manual of Clinical Enzyme Measurements. While some of the presentation may seem somewhat dated, the basic concepts are still helpful for researchers who must use enzymes but... | 0.873575 |
A thorough knowledge of the root system of plants is
essential if their growth, flowering, and fruiting responses are
to be understood. The structure and growth habits of roots have a
pronounced effect on the size and vigor of the plant, method of
propagation, adaptation to certain soil types, and response to
cultural ... | 0.54068 |
In Journey into the Cell, we looked at the structure of the two major types of cells: prokaryotic and eukaryotic cells. Now we turn our attention to the "power houses" of a eukaryotic cell, the mitochondria.
Mitochondria are the cell's power producers. They convert energy into forms that are usable by the cell. Located... | 0.962882 |
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