Oct. 31 (UPI) -- A nine-day online auction of physicist Stephen Hawking's memorabilia, including his motorized wheelchair, began on Wednesday.
Twenty-two items are up for auction by Christie's auction house in London. The wheelchair has already received a bid of over $25,000 and is expected to sell for about $215,000. Also to be auctioned are Hawking's script for an appearance on The Simpsons television program, which has received a $1,800 bid, and an invitation to a 2013 "Time Traveler's Reception," one of 100 meant to unite anyone on Earth who returned from a future time. The current bid for the invitation is $4,466.