Thread: Inventions?

Hi everybody,
Does anybody have an idea for an invention that can help the world in one way or another?
I was thinking of creating a hover board (it's a homework assignment) but how would I explain how that would work?
If that won't work, what's a different idea I could take? I've been thinking about something that can help give people food or water or maybe a different form of energy.

My other good idea was mechanical organs.
How would I invent a mechanical organ that would be able to work so a person who needs an organ-donor doesn't have to wait, and doctors can just put in a mechanical organ? How would that work and where would it get its energy from?
Thanks!