" Is there any point in hosting a party for time travellers? Would you hope anyone would turn up? In 2009 I held a party for time travellers in my college, Gonville and Caius in Cambridge, for a film about time travel. To ensure that only genuine time travellers came, I didn't sent out the invitations until after the party. On the day of the party, I sat in college hoping, but no one came. "

― Stephen Hawking , Brief Answers to the Big Questions