Stephen Hawking on Time Travel

In 1995, with their forthcoming 15th anniversary issue in mind, The Face magazine approached Stephen Hawking and asked him for a time travel formula. They soon received the following response by fax. Transcript follows. (Source: The Face’s former editors, Richard Benson & Johnny Davis; Image: Stephen Hawking, via.) Transcript UNIVERSITY OF CAMBRIDGEDepartment of Applied Mathematics and