A Real Miniature Car, Powered by Hydrogen Fuel!
Up for a little time travel? Let's way go back to days of morse-code and the early "wireless". I haven't tried these kits yet, but they look very interesting: Radio Receiver and Morse Code Kit
The product description says that they're best for ages 10 and up. However, they also say, with adult supervision, they're good for ages 3 and up. Cool! Sounds like a family activity to me!

I haven't tried this kit, but it looks pretty straightforward and easy to build...with styrofoam balls as phospate groups and sugars.
FloraCraft Fun Learning DNA Kit DNA model kit
