Air Surfing (AKA Walkalong Gliding) with very thin foam. Levitate even with only your hands. Looks like magic, but what’s the science?
Best DIY Boomerang in the Wide World?
Wind-up Dragonfly Helicopters fly higher than the tallest trees. There is a simple version and a high-performance version.
Make a Hot Air Balloon (aka Sky Lantern) from a plastic bag.
The Ponyo Type Putt Putt Boat has a real candle powered steam engine made from a soda can and straws.
The Overhead Water Rocket Launcher uses pressurized air and water to launch 2-liter bottle rockets.
Call it a Vortex, whirlpool, tornado, hurricane, dust devil, water spout... whatever you call it, it happens a lot in nature.
Robot Hands work like our real hands... with strings attached.
Aside from the shear fun of it, making the Robot Voice 10 Cent Talk Box reveals how we turn raw sound from our vocal folds into speech.
It's not high-tech, but whistling on an Acorn Cap involves some cool science.