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

What has two legs and carries its baby in a pouch? Fill in this crossword puzzle and learn some fun facts about two-legged creatures!

In 2012, an 80 million-year-old dinosaur was discovered, and you can learn all about this 20-foot, 2-ton horned herbivore.

What do a key, a goldfish, and a tortoise shell have in common? Find out with this second-grade science worksheet!

Dive into the electrifying concept of electrical energy in this colorful worksheet!

Did you know that some caribou travel 3,000 miles in a year? This fun worksheet is jam-packed with fun facts about the caribou!

Did you know new species of animals are discovered every year? Color in this little cricket, the only one of his kind who can pollinate plants!

Describe how things feel when you touch them and push on them!

Practice classifying different animals in this engaging life science worksheet, created for second and third graders!

Learn about the similarities and differences between objects in this colorful science worksheet!

Students practice classifying items as liquids or solids for a lesson on the states of matter in this fourth grade physical science worksheet.

Who will win the marble race in this two-page physical science worksheet?

Use this cool 2-page worksheet to make your own big dipper clock!

Use this fossils worksheet to help a child learn about life on earth. Your child will learn about evolution and extinction, and also form a hypothesis.

Match forms of energy to common examples in this third- and fourth-grade science worksheet!

Explore the strength of magnetic forces with this worksheet for third and fourth graders!

Prepare for an exciting experiment with this cut-and-paste lab safety worksheet for first and second graders!

In this worksheet, children practice identifying animals of North America by their tracks.

Learn to identify and name the parts of a seed in this two-page science worksheet and quiz!

Fly high with The Wright Brothers, two siblings who soared to the forefront of history with their design for the first modern airplane.

In this worksheet, students will read two different passages about the platypus. Kids will compare and contrast the passages, and identify the main ideas.

This Bandicoot coloring page features two pictures to color of this rabbit-like animal and the opportunity to learn a few fun facts about Bandicoots!