"How to Invent Everything is such a cool book. It's essential reading for anyone who needs to duplicate an industrial civilization quickly." --Randall Munroe, xkcd creator and New York Times-bestselling author of What If? The only book you need if you're going back in timeWhat would you do if a time machine hurled you thousands of years into the past. . . and then broke? How would you survive? Could you improve on humanity's original timeline? And how hard would it be to dome