Astrophysicist Stephen Hawking is assisted off the tarmac at the Kennedy Space Center by his caregiver, Monica Guy, as he is applauded by members of the flight crew after completing a zero-gravity flight, Thursday, April 26, 2007, in Cape Canaveral, Fla. Free of his wheelchair and tethered only to heart rate and blood pressure monitors, Hawking on Thursday fulfilled a dream of floating weightless on a zero-gravity jet, a step he hopes leads to further space adventures.(Xinhua/Reuters Photo)

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