Gorillas, groceries, pirate treasure, and aardvark homes: these are just a few of the things children will search for and find in this week's Afterschool Adventure, Lost and Found. Children will use position words like above, below, and...

Welcome to Martha's STEM Stories! STEM stands for science, technology, engineering, and mathematics. You may already know that doing STEM means testing ideas, collecting data, making calculations, and drawing graphs and charts-but you...

In this week's Afterschool Adventure, children will use number powers to solve problems and save the day! They will use grouping power to save a parade, skip counting power to catch a pie-snatching thief, and speed counting and place...

Get your spy glasses ready! In this weeklong adventure, children will explore shapes and their attributes and use this knowledge to decode a secret message. Children will learn about two-dimensional (flat) and three-dimensional (solid)...

Patterns are everywhere! In this week-long learning adventure, children will discover what a pattern is and explore patterns in different ways. Children will learn that patterns consist of a "core" or "unit" that repeats as they identify...

In this week's Afterschool Adventure, Appetite for Fractions, children will explore fractions as they help create, divvy up, and serve a variety of real and virtual snacks.

It's time to stand in the spotlight! During this Afterschool Adventure, children will learn about and practice a variety of math skills as they gather information about their favorite subject-themselves! Children will start out by...

In this illustrated essay from NOVA Online, explore the cyclical process of weather creation and the effects of El Nino on the global weather system.

Learn what it takes to build an igloo from the best kind of snow to the most effective tools and other little-known facts about these traditional Canadian Inuit structures in this interactive activity from NOVA.

This interactive activity from A Science Odyssey tracks the journey of a sound wave from the moment a musician sings into a microphone until his voice reaches the vibrating speakers of an AM Radio.

In this interactive activity from the NOVA Web site, animations explain different aspects of the properties of metal.

In this interactive activity from NOVA Online, learn about a type of exploding star - a Type Ia supernova - that is so bright that astronomers can measure the distance to the galaxy in which it resides, and even learn which elements make...

Discover the difference between free-falling and weightlessness in this interactive activity from the NOVA: "Stationed in the Stars" Web site.

This interactive activity from the NOVA Web site samples Galileo's experiments with falling objects, projectiles, inclined planes, and pendulums.

This Evolution Web feature explores how evidence can support a variety of hypotheses surrounding the mystery behind the extinction of the dinosaurs.

Examine this graph from FRONTLINE/NOVA: "What's Up with the Weather?" Web site to see dramatic increases in three greenhouse gases over the last two hundred years.

In this letter written to his friend and mentor Charles Lyell less than three weeks after the publication of "On the Origin of Species", Darwin describes the reaction of the great anatomist Richard Owen to his theory. From Charles...

John Noble Wilford, a "New York Times" science writer, outlines various hypotheses on the origin of bipedalism.

You're the geneticist now. In this interactive feature developed for the companion Web site for NOVA/FRONTLINE: "Harvest of Fear," use the latest in genetic technology to engineer your own "supercrop" of tomatoes.

Find out how DNA profilers analyze bits of tissue to identify human remains. From the NOVA: "Lost on Everest" Web site.

This list from NOVA: "Cracking the Code of Life" Web site provides some of the basic, yet impressive, facts and figures about the Human Genome Project.

Browse through a table full of genetically modified (GM) foods to see what's available now and what's to come. From FRONTLINE/NOVA: "Harvest of Fear."

This graphic from Ecology and Evolution of Darwin's Finches by Peter Grant presents data from the Galapagos Islands, showing that a severe drought put selective pressure on the population of Darwin's finches and resulted in a change in...

Think like an engineer and build an aqueduct in this interactive activity from the NOVA: "Secrets of Lost Empires: Roman Bath" Web site.