Andy Weir is the creator of Mark Watney, a fictional astronaut who can solve any problem the harsh environment of Mars throws his way. But Weir, author of The Martian, ran into a tricky problem on Earth this week when his e-mail and Twitter accounts were hacked. The culprit, he says, was a hacker who reset the password for his Comcast.net e-mail account by calling Comcast and pretending to be him.