A food tree that grows food whenever you plant it, so nobody would ever have to go hungry again.
Most people phrase that was "Iwant to end world hunger" but you win Ms. USA!!!!!
My invention would be ... a self updating computer. Like that automatically gets new updates (i.e. new prossessors more ram new version of software) so that you don't have to spend a couple hundred every year just to be able to play the new games that come out
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