Learn the ins and outs of one of the body's most important organs: the heart!

Introduce your student to an endangered species, Przewalski's horse, with this information sheet. They can color the illustration as they read.

Introduce your child to a fascinating new animal, the Baird's tapir. This is just one of many endangered species around the world.

Have you ever wondered what keeps the moon in orbit? Newton's first law gets a quick introduction, too, in this worksheet for kids. Check it out!

There are lots of stories around the world for the rabbit moon: a rabbit image seen in the shadows on the moon's face. Here's one for young moon-gazers!

This worksheet is a quick-reference tool of space vocabulary for kids, with an exercise to use the words properly in provided sentences.

Learn all about light refraction by simply placing your pencil in a glass of water. Warning: your pencil may not be quiet the same afterward.

Get in tune with nature, and read a bit about an endangered species of animal, the Black-footed Ferret. Your child can color an illustration as he reads.

Help your child understand why it's so important to take care of the environment with this info-sheet about an endangered species: the spectacled bear.

Introduce your flashlight to mirrors. Mirrors are cool surfaces that reflect light just as well as they reflect your face.

Practice geology vocabulary with this challenging crossword puzzle.

Introduce children to physicist Albert Einstein — and a bit of theoretical physics — with this mini biography.

Did you know that each tree tells a story? In this worksheet, children peer inside a tree to learn about the layers in its trunk.

Let your kid's knowledge of leaf vocabulary climb as high as a tall, tall tree with this fun word search.