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

If you push your little brother, does he push back? Well, according to Newton's third law of motion, he does!

How fast does sound travel? Help your child figure out the physics of sound waves with this informative worksheet.

We all know the famous equation E = MC^2. But what does it mean? Learn a bit more about Einstein's famous energy equation with this physical science worksheet.

Did you know that sound is actually caused by movement? Vibrations of particles create the sound that we hear.

Test your students' knowledge and memory of periodic table elements with this crossword puzzle.

Little chemists can learn more about the elements in the periodic table with this helpful worksheet about molecules and compounds.

This cool physics worksheet helps kids learn how centripetal force and centrifugal force can explain why short track speed skaters don't fall over during turns.