Some people seem to deal with long-term zero-G better than others. The cosmonaut who spent the longest continuous time in space was Valeri Polyakov, who spent 4

Some people seem to deal with long-term zero-G better than others. The cosmonaut who spent the longest continuous time in space was Valeri Polyakov, who spent 437 days in zero G in the early 1990s, came back fine, had a good career after returning, and recently died at age 80.