Have you ever wondered why manhole covers are round? It's a good thing to know -- big companies sometimes ask that question in interviews.

Does your little gardener know about compost? Quiz him on the basic elements of this excellent gardening tool.

Here is a brief introduction to The Great Pacific Garbage Patch for kids!

Who is this Frankenstein guy anyway? He's not the monster -- he's the guy who invented him.

This packet of worksheets introduces children to food webs, an important life science concept.

Do you know how clouds form? Get the basic idea of how moisture in the air can become a cloud.

Need a colorful way to impress your friends and family? This worksheet has got you covered!

Where do flower babies come from? Find the answers in this word search about plant reproduction!

Which animals can live happily alongside humans? With this word search, match up game, fun facts, your child will learn more about urban animal habitats.

Read about how the capybara live and other interesting facts about capybara. Sure to satisfy your curiosity about capybaras!

Crank out a better understanding of simple machines with this worksheet all about the wheel and axle!

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

Learn all about the science of the movies and the basic concepts behind how they work.

This page is all about building your kid's natural resources vocabulary words, along with research skills.

If Dorothy had lived a little further south, she might have been swept away to Oz by a hurricane.

How can you tell how old a tree is? Look no further! This worksheet gives a basic overview of tree rings for your little scientist.

What is the water cycle? We're glad you asked! Learn about this amazing natural system that's been working for billions of years.

Learn a bit about meteors, asteroids and comets as they travel across the night sky. Can your child round out the page by adding color to these orbiting rocks?

Back in ancient times, before people knew what the stars were, they told stories about them! With this worksheet, learn about the constellation Cygnus.

Little biologists will use this respiratory system diagram to identify the most important parts of the human respiratory system and their functions.

Dragonflies are some of the oddest looking insects in the world, so it's appropriate that they have so many unique characteristics. Read all about them!

One of the most famous and easy to spot constellations is the Big Dipper! Formally known as Ursa Major, this constellation was named after a bear.

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

This Louis Pasteur biography goes over his accomplishments, and includes a bacteria-based science activity at the end!

Ecosystems are an important part of fourth grade science. This fun printable will help your child with her knowledge of plants and animals.

Use these STEM design challenges to foster creativity and critical thinking skills in young learners while introducing them to the engineering process.

Get to know Earth's star with with this diagram and vocabulary worksheet!

Blast off deep into space with this science worksheet featuring the dwarf planet, Pluto.

Get to know some of the friendly, furry, feathery river wildlife that live near American rivers, then match each one to its home.

It's a paper parachute brigade! Learn how to build your own parachute, and learn how the parachute was invented over 500 years ago.