B.K.
We just threw a Mad Scientist party for my 5 year old. The kids (and adults) loved it! There's a company called Mad Science who does them too. I think it's $175 - $225 to come out. However, I spent $100 and did it myself. This included everything! ...supplies, goggles, lab coats, party favors, cake, snacks, punch...you name it. I think the 7 year olds will have even more fun with it than the 5 year olds. The experiments we chose were lava lamps, mentos and diet coke, cornstarch and water goo, playing with magnets and various objects that were and weren't magnetic. Testing out what sinks and what floats and rising raisins. Take a look at birthdaypartyideas.com. There are tons of mad scientist ideas and experiments. I bought plain white boys t-shirts for lab coats. Goggles in the dollar bin at Target. Make a volcano cake and smoking punch with dry ice. Save the mentos experiment for the grand finale. The kids LOVED it!!! Send them home with the goggles, lab coats and lava lamps and you won't need party favors. Maybe even index cards with instructions on how to make goo. Anyway, it was a total hit! I think he'd enjoy it. There are some GREAT ideas on the website provided (search under "science"). I was just too lazy to do all of the amazing decoration ideas and didn't have time to do a cool invitation.