I want to buy Adidas superstars but they are too common now and even fake ones are being sold. Is there other shoes that is equally cool and popular?
If one were to construct a traversable wormhole I understand negative exotic matter would be needed to hold it open. But would the mass of the exotic matter need to equal that of the singularity within?  I know wormholes are only theoretically possible and there is no proof of their existence but this is for a fiction piece.