Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.
SHIVERY snow paint is easy to make and SO FUN! Kids can create snowmen and other works of art that dry puffy and are COLD to the touch. Shivery Snow Paint Recipe Shaving Cream White school glue Peppermint extract Iridescent glitter or buffalo snow