Balloon ninjas to shoot with nerf guns. This is a fantastic idea! Great for little boys! I know this was posted as an idea for little boys. but I think I'd like to have a nerf gun battle with these ninjas.
Tasting the rainbow: The ants whose multi-coloured abdomens show exactly what they've been eating
Very Cool! This could be a fun science fair project someday :) Ants stomachs are transparent. a woman noticed it when ants drank/ate spilled milk one day so she gave them some colorful candy and then photographed them! Wierd and cool.
It is called the swedish fire log. pour and soak for a few days or weeks. then when you need it start it on fire and you have a fire log that last for hours. we did this in the snow when we had parties or people over to keep warm.
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.
Leave of Mountain Dew in bottle, add a tiny bit of baking soda and 3 caps of peroxide. Put the lid on and shake - walla homemade glow stick (bottle) solution. What a fun summer thing to do with the boys!