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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.

Ever wonder why sounds change as they move away from us? Learn all about the Doppler effect with this physics worksheet.

Energy is a crucial part of physical science! All things on Earth have energy, whether it's potential or kinetic.

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

Learn how energy changes forms with this fourth- and fifth-grade physical science worksheet!

Play a fun game that combines the periodic table with a classic concentration game.

Get charged up about static electricity with this informative fourth- and fifth-grade worksheet!

Warm up your scientific thinking with this colorful worksheet!

With this worksheet, kids read about the sport of biathlon and gain an appreciation for the skills involved by studying the math and physics behind them!