Backward in Time

Backward in Time

(alt-text)

People tell me I have too much time on my hands, but really the problem is that there's too much time, PERIOD.

See also: https://xkcd.com/1017/spreadsheet/

Special 10th anniversary edition of WHAT IF?—revised and annotated with brand-new illustrations and answers to important questions you never thought to ask—coming from November 2024. Preorder here!