Here's a cool and fun way to raise kids' awareness of UV exposure - UV sensitive beads.
UV Beads have a chemical substance embedded into the plastic that will change color when exposed to UV radiation (sun light).
The beads will remain white indoors as long as they are kept away from windows or doors where UV light can leak into the room.
The key thing is to get your kids to check them regularly when they are outside - ESPECIALLY ON AN OVERCAST DAY. Cover up, when they light up!