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

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!

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!

Hey, did you hear that? Explore real-life examples of sound energy with this kindergarten and first-grade worksheet!

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

Write down the name of each season that is shown in the pictures then color them and turn this worksheet into a unique placemat that can be used year-round!

If a ship went down, would these items sink or float? Your little one will decide, with this fun worksheet to help him hone sorting and categorizing skills.

See if you can identify the objects that let light pass through them with this kindergarten and first-grade worksheet!

These two children sure look alike -- maybe because they're twins!

Did you know that having a pouch or a shell can help an animal meet its needs? Learn how animals use different parts of their body with this matching worksheet for kindergarteners and first graders!

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.

Print out a set of weather-themed postcards to give your child practice identifying seasons. These weather postcards also allow kids to practice writing skills.

What does a seal eat? Kids choose the pictures that show what kind of food each animal likes to eat in this first grade life science worksheet.

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

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

Did you know snowflakes are so unique, there are no two alike? Teach your child about how snow forms with this worksheet.

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

Match the sense to the picture in this five senses worksheet!