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(Credit: Donna Tam/CNET) SANTA CLARA, Calif.--Some of Silicon Valley's greatest minds used an interesting piece of hardware to vote on which trends will rule the tech world: ping pong paddles. The Churchill Club, a business and technology forum, hosted discussion here Tuesday night, along with Forbes magazine, to pick the brains of Kevin Efrusy, Bing Gordon, Reid Hoffman, Steve Jurvetson, and Peter Thiel.