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.

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.

Children are introduced to the concept of the speed of light in this illustrated worksheet.

Don't let school year learning slip away this summer: use this chemistry worksheet to practice identifying elements.

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

Did you know that light could bounce? Set up a light obstacle course with a few mirrors and watch light bounce around your room.

The periodic table of the elements is an important classification system of the most basic particles that make up our world!

Introduce your flashlight to mirrors. Mirrors are cool surfaces that reflect light just as well as they reflect your face.

Children learn the fascinating physics behind lightning, along with a few fun facts, in this physical science worksheet.