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

Discover some of the fascinating properties of gravity by studying one of Newton's famous laws, the Law of Gravitation.

Energy is a crucial part of physical science! All things on Earth have energy, whether it's potential or kinetic.

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

If you push your little brother, does he push back? Well, according to Newton's third law of motion, he does!

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

Kids learn about the Earth's solid and atmospheric layers, then label the diagram with the correct terms in this fifth grade Earth science worksheet.

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!

We all know the famous equation E = MC^2. But what does it mean? Learn a bit more about Einstein's famous energy equation with this physical science worksheet.

That's not a lake... it's a crater! Get the scoop on some of the world's most well known craters with this space science worksheet.

It's a bird! It's a plane! It's Physics Man! Test your knowledge of the physical world with this fun questionnaire that takes physics to a super-heroic level.

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!

Learn about drag, air resistance, and Newton's laws with this cool worksheet on bobsled physics!

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 how to convert centimeters to inches in this practice worksheet.

If your student is stuck on Celsius, hand him this multiplication and division practice sheet.

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.

This Louis Pasteur biography goes over his accomplishments, and includes a bacteria-based science activity at the end!

Get to know Earth's star with with this diagram and vocabulary worksheet!

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.

Shake up your science studies with this worksheet about earthquakes.

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