Making something that does not require electricity. Although, you may be able to fool people into thinking it does. We are going to be making Heron’s fountain out of common household materials. This is a really easy build and would be a perfect project for to build with your kids. Maybe you could even sneak in a lesson on fluid dynamics or perpetual motion?
Heron (Hero) of Alexandria was a mathematician and an inventor. He is well known for his steam engine, the Aeolipile, and many other inventions that use pneumatics. (wikipedia) I am going to try and recreate one of my favorite inventions by Heron, the “Heron Fountain”.
Total cost of build = $2 (you can scavenge the 3 water bottles)