Have you considered why elephants have trunks, or why polar bears have thick fur? Reflect on animal adaptations with this fourth-grade worksheet!

See just how connected the ears, nose and throat are with this anatomy worksheet!

Learn about the integumentary system, which is really just a fancy phrase for "skin", in this worksheet.

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

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

Learn more about the bones in your body and just how important they are with this reading sheet and diagram, all in one.

This skeletal system worksheet, featuring a funny diagram of a human skeleton, is just the thing kids need to master their skeletal system vocabulary.

Did you know people can live with just one kidney? Get a head start on human anatomy with this info sheet on kidneys.

Just like the rest of our body, our eyes are a complicated system! Learn about how the human eye works with this anatomy sheet.

Where'd that shadow come from? Next time a scary shadow crosses your path, you'll know just what to look for.

Atoms are some of the tiniest particles that make up our world. Give kids some perspective with this worksheet that shows kids just how small atoms are.

Who knew that the machines of the world are all made of just 6 simple machines working together? Introduce your child to simple machines with this worksheet.

It's easy being green when you have our Earth Day game for a guide. Just print out this Earth Day game and get ready to score one for the planet.