My idea for the NASA Space Apps is for a biological digestive system to process ore in space, though I don't think it will fly, as most of the contestants are practised in software engineering. Earlier this month I went to Melbourne for 6 days for the Australian International Aerospace Congress - 2 days in Melbourne, and 2 days at the Avalon Defense and Aerospace Airshow, with morning presentations, and gawking at the lovely boy's toys the rest of the day. ;-)