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Meet the master of compound machines: Rube Goldberg! His wacky contraptions put a whole new spin on the use of simple machines.

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

Where is the liver located? Using the diagram as a reference, kids cut out the different parts of the liver from this worksheet and piece them together.

Read about one of Yellowstone National Park's coolest animals, the big horn sheep.

This Earth Day quiz family and friends with this true or false questionnaire. It's all in good, informative, fun!

Explore the life cycle of a pumpkin with your kids with this colorful cut and paste growth chart.

Where is the Earth in space? Check out this worksheet that describes where weÃand some of our neighborsÃare in our galaxy.

Earth has many different land and water features—can you recognize them? Test your knowledge with this crossword puzzle for third and fourth graders!

Explore grasslands and their fauna in this thought-provoking worksheet!

Deserts might seem inhospitable to life, but there are actually plenty of animals that can live there!

Explore a tropical rainforest habitat and its inhabitants with this engaging worksheet for third graders!

Determine if certain animals could live in a temperate deciduous forest with this habitat worksheet for third graders!

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!

Dive into a coral reef ecosystem with this life science worksheet!