For whatever reason, nothing seems to make kids happier than playing with water, especially during the summer! Here's a great DIY activity project that will a) get them outside and b) keep them there (not to mention keep them entertained for hours).
Just because school is out for the summer doesn't mean you can't enlighten some minds with science! I mean c'mon, kids of all ages are fascinated by silly putty, add some magnetism to that equation and BAM! You've just blown a few minds. What more coud you ask for?