Build a redwood tree that is taller than you and that can stand on its own.
Build a device that can map out the shape of the ocean floor.
Design a tool that an astronaut could use to pick up an object in space.
Create a bio-glue that holds together a graham cracker skyscraper.
Build a Mars rover that can travel using elastic energy.
Design and build a paper bird that can glide at least 6 feet.
Create a simple machine that transfers motion from one straw to another using a belt. Make sure the direction of your motion remains the same.
Build a device that will carry a seed at least 3 feet from where it is launched.
Design and build a powerful bird wing that can spin you around in an office chair when you flap it.