Last year, my hubby and son went the pre-boxed project route. My guys pulled together a fun with magnets project bought at Micheal's. They have a great assortment.
Flash forward to today: it's that time of year again and my son has waited until the very last day to work on his third grade science fair project. Every year I say to him that he should do an optional project if he wants to... WITH DADDY. My hubby doesn't mind, but he's pretty stern about only helping my son after he's initiated all prep. Sounds great, but also unrealistic at times, so this infamous prep. work falls to me.
This year I survey some folks to get their ideas. One quick and easy idea was to match-up brands of bubble gum, compare and contract and find out which brand blows the biggest bubble. Now that's an interactive and fun idea.
Here are some other cool ideas (from parenting.com):