British physicist Stephen Hawking's motorised wheelchair, medals and awards, and a signed copy of his PhD thesis are among a range of items set to go under the hammer in the UK.
He was diagnosed with motor neuron disease at 21 in 1963, and was given two years to live.
On any day of the year, you could pick up Hawking's 1988 bestseller A Brief History of Time: From the Big Bang to Black Holes for less than 20 bucks at most bookshops.
One of five remaining copies of Hawking's 1965 doctoral thesis from Cambridge University will be part of the auction.
The sale includes a script from one of Hawking's "Simpson's" appearances, a copy of his bestseller "A Brief History of Time" signed with a thumbprint and a personalized bomber jacket that he wore in a documentary. Shortly after it went live, requests to view the research crashed the website, with nearly 60,000 downloads in less than 24 hours.
"He was diagnosed with ALS (amyotrophic lateral sclerosis) just as he arrived in Cambridge to begin his Ph.D. studies", Venning said.
Also being auctioned off is the wheelchair Hawking used from the late 1980s to the early 1990s, before he lost the ability to use his hands.
"...[G] iven his extensive travels to conferences and public events, as well as the scope of his intellectual explorations of space-time, this is arguably both literally and metaphorically the most-travelled wheelchair in history", notes the auction house, humorously observing that Hawking "was even renowned for being a rather wild driver".
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Perhaps more surprising, among some of Hawkings most prized possessions was a script from an episode of "The Simpsons".
Ms Hawking said Christie's had been helping the family "manage our beloved father's unique and precious collection of personal and professional belongings".
The thesis "was the fruit of him reapplying himself to his scientific work", Mr Venning said, and Professor Hawking "kept it beside him for the rest of his life".
Lucy Hawking, the late physicist's daughter, told the AP that the auction will give "admirers of [Hawking's] work the chance to acquire a memento of our father's extraordinary life in the shape of a small selection of evocative and fascinating items".
Hawking will be in good scientific company at the auction. Hawking will take his place among Britain's greatest scientists when his ashes are buried in Westminster Abbey, Friday June 15, 2018, between the graves of Charles Darwin and Isaac Newton, during a service of thanksgiving for the physicist who died in March 2018.