Build a water filter that can clean dirty water.
Make a machine that can jump up more than 3 feet.
Build a box that only you know how to open and is safe from hackers.
Build a system that controls the movement of material and shuts off automatically.
Build a joystick that can turn on and turn off multiple things
Build a helicopter that flies at least ten feet in the air and stays up for three seconds while carrying one penny.
Build a lightweight wing structure that is 12 inches long and can hold up a heavy load (weight) without deflecting.
Build a satellite with a 6-inch square body that can deploy its own solar wings and antennae, and can fit inside a 9-inch diameter tube.
Build a plane that is powered by stored energy from a rubber band, balloon or spring. The plane should be able to fly straight for 5 feet.