Educational: Mathematics, science and technology, general

Dotty, stripy, straight and swirly-patterns are all around us.

How does a tadpole become a frog?

How does a foal grow into a horse?

How does an egg become a butterfly?

Twelve-year-old Clyde Tombaugh stepped up and took his first look through a telescope.

Young children usually think of their home as the structure in which they live.

Emery J.

What's that funny feeling coming from your gut?

Have an itch?

Your mouth really is filthy!

From snot and phlegm to earwax and eye gunk, there's some pretty gross stuff in that body of yours!

Have you ever crashed your bike and torn up your knee?

Americans are divided over the future of the U.

Once embraced only by environmentalists and "e;health nuts,"e; the organic agriculture movement is flourishing in the United States.

In this fun-filled look at fractions, Brian P.

Earth has a water problem.

Earth has a pollution problem.

Earth has a litter problem.

We use electricity and other types of energy every day.

On Earth Day, we find ways to help the Earth.

We all throw away too much stuff!

What's longer than a football field, weighs more than 450 cars, yet flies miles above Earth's surface?

How long does it take to get into outer space?

How can robots help us explore space?

Could there be other planets in the universe similar to those in our solar system?

Have objects from space ever hit Earth?

What space objects can have millions of times more mass than our Sun, but they remain invisible?

People, animals, machines, and wind all make sounds.

Solids, liquids, and gases are the three states of matter.

You know that magnets hold pictures on a refrigerator.

The sun, lightbulbs, and flickering fires all bring light to our world.

The sun, furnaces, and ovens all make heat.

Electricity powers lights, computers, and television sets.

What do bicycles, doorknobs, and screwdrivers have in common?

What do a doorstop, a butter knife, and the front of a boat have in common?

What do jar tops and water-bottle lids have in common?

What do flagpoles and some window blinds have in common?

What do hammers, wheelbarrows, and brooms have in common?

What do staircases, dump truck beds, and ramps have in common?

Many people store food in refrigerators and clean clothes in washing machines.

Many people use cell phones and e-mail to communicate with others.

All kinds of animals have skin-even humans!

What animals have shells?

Some mammals have a little fur or hair, others have a lot!

See how birds use feathers for flight, warmth, camouflage, and much more.

The oil spill was the largest in U.

Have you ever wondered how stars are born?

Uncover seven wonders of the four rocky planets.

The universe is full of space phenomena, such as dark matter, dark energy, and the beginning of the universe.

From earliest times, humans have wondered about the sky above them.