When we get embarrassed or anxious, and all of a sudden our cheeks get red! Why does our body do this? Find out what scientists think blushing is all about.

Are cats trying to talk to us when they purr? Discover the meaning behind the purr in this worksheet that explores the three main types of cat purrs.

Hiccups interrupt us when we're talking and sometimes even get in the way of eating! Find out why we hiccup and discover some unusual ways to get rid of them.

Do you measure distance in inches or seconds? When do you use miles? Answer these and more with this third-grade worksheet about the customary system of measurement! 

Reflect on the effects of habitat change with this third-grade worksheet!

These clever birds harden and disguise themselves as tree branches when threatened. Learn more and do some coloring with this worksheet.

Find out how scientists explain our yawns and use the graph to keep track of your family's yawns for a whole day!

Dreams can be delightful or downright terrifying. Discover the science behind dreams and try to figure out what your dreams say about you.

Find out all about the different parts of the eyes and how they work together to make vision possible.

Ever wonder what makes the leaves change colors in the fall? Find out with this fascinating life science worksheet.

Right now the Earth is spinning, whether we can feel it or not. Do you know why? Uncover the science behind our spinning planet with this informative worksheet.

Have you ever wondered why giraffes have long necks or why lions have sharp teeth? Find the answers in this third- and fourth-grade worksheet about adaptations!

Children hone their powers of observation using this worksheet template.

Every four years something funny happens with our calendars -- we add a day! Why do we do this? Discover the science behind leap year.

How do the Sun and the Moon interact with the Earth, and how do all three depend on one another? Find out in this science worksheet.

Why do some desert animals have large ears? Why do others have scales? Learn the answers to these questions and more with this life science worksheet!

Use a seesaw to see what happens when opposing forces become balanced or unbalanced!

Do you know why Mars is called the Red Planet? Find out that and more on this planet printable.

How much do you know about our home planet? Boost your Earth knowledge with this science printable.

Do you ever see shapes in the stars at night? In ancient times, people named these shapes, and now we know them today as constellations!

Children discover and review the parts of a flower and what they do as they complete this botany-themed crossword puzzle.

How much do you know about the U.S. national bird? Learn all about the bald eagle with this fun, informative worksheet!

It's pretty rare when a planet comes between Earth and the sun, but it happened on June 5, 2012. Learn about this mind-boggling event with this cool worksheet!

What is energy? Energy is the ability to do work! Use this colorful worksheet to teach your little scientist the basics of energy.

These are the largest tortoises in the world, yet they are only two inches long when they hatch! That's one of the facts you can learn from this worksheet.

How much do you know about man's best friend? This fun worksheet is jam-packed with fun facts about dogs!

How much do you know about our solar system's planets? Kids learn facts about Neptune in an out-of-this-world worksheet.

Mmmm honey is delicious, but do you know how it's made? Take a dip into some sweet knowledge and find out the buzzy secrets behind honey.

How much do you know about the Snowy Owl? Learn a few fun facts about this species with a fun sheet, including a dot to dot!

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.