solar beads (buy online at www.discountschoolsupply.com)

pipe cleaners

keyrings (buy at craft stores or online at www.discountschoolsupply.com)

String solar beads onto the pipe cleaner and twist to secure.  Attach to the key ring.  Shape the pipe cleaner into a letter shape to personalize!  Take your keychain outside to test the strength of the UV rays!  The stronger the rays, the stronger the color that the beads will turn.

Science:

The sun gives off invisible light rays that are called "ultraviolet" or UV for short.  These are the rays that damage our eyes and skin.  That's why we need to wear sunglasses and sunscreen when we are outside.