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A foolproof app that tells you instantly if they are a jerk masquerading as a good guy, or truly a nice person. I guarantee there is a market for that.
Please, god, no.
Dryer sheets that repelled the smells of others.

Teleportation.
Or time travel. I'd accept either one at this point
I concur with both of those
One of those computers like on the original Star Trek that makes food for you in an instant.