Here’s a really cool set of DIY solar power bottle boat kits. If you have a lake nearby or even a pool in the backyard, it might be a great idea to get your kids started on eco-science experiments. $24.95 at SpheralSolar.com
This is a fun kit to build your own solar powered boat. You provide the recycled soda bottle and the kit has everything else you need.Includes complete instructions with 3 boat designs, waterproof solar panel, motor & wires, propellers for water and air, tape, shafts and more.All you need to add is a plastic soda bottle and a sunny day! Generally recommended for ages 10 and up.