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

Can you explain why your blue shirt is blue? This worksheet is full of facts about light and how it reacts with objects to give us the perception of color.

Finish the illustration on this worksheet to reveal why the boy is happy. Help your child build creative and critical thinking skills with this worksheet.

Your first grader will soar high above the skies as he completes addition problems with sums of 9 or less in this math worksheet.

Use this glossary with the EL Support Lesson Plan: Who, Where, What, When, Why, and How Questions.

Aspiring astronomers, here is a wonderful introduction to the constellations! Your child can learn about Aries the ram with this worksheet.

Use these vocabulary cards with the EL Support Lesson Plan: Who, Where, What, When, Why, and How Questions.

Read this Mother Goose's Treasury classic, then answer the reading comprehension questions.

This worksheet will help your kindergarten students practice the skill of estimation while also working on their counting and number identification skills

Help your child with his math skills with this printable worksheet, which will give him practice with simple subtraction.

Here's a coloring page that will teach your child a species of bird, and the Latin name for it!

This colorful worksheet will help kindergarteners develop ideas for persuasive writing about their favorite desserts. The worksheet includes prompts like "I think" and "it is the best because."

Find out the the cool science behind ice cubes with this fun worksheet.

This social studies worksheet is a great way to encourage the next generation to understand the value and impact of voting while helping learners practice reading comprehension strategies.

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.

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.

How did salt ever get into the ocean? Find out how, and then try conducting your own salt water experiment.

This worksheet, featuring stars, moon, planets and rocket ships, is all about finding the pattern in a series

Take to the sky (and water!) in this seaplane coloring page.

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

On a warm day, what better way is there to travel than by hot air balloon? Have your child pull out those bright crayons and add some color to this fun scene.

These celestial words are all missing their first letter! Kids completing this kindergarten reading worksheet write the correct letter to complete each word.

Introduce your child to a fascinating piece of art history with a cute coloring page. She'll learn about this little hippopotamus sculpture.

This Thanksgiving coloring page features a turkey balloon flying high in the sky.

Grandma and grandpa didn't always have gray hair. Find out about what gives our hair color and what makes our hair lose that color as we get older.

Learn all about Delaware's state bird, the Blue Hen Chicken.

What color would you use to color in a dog named Blue? Enjoy a box of crayons with Blue, one of 20 winners from our Color Your Mutt contest.

Explore the deep blue sea with this submarine coloring page.

Kids practice two-digit subtraction on this colorful sky-themed 2nd grade math worksheet.