NASA wants to study the short and long-term side effects that lack of muscle use has on astronauts. So they'll pay you to lay in bed with your legs elevated for 90 days. You're limited to watching TV, reading, and using a computer. I guess you could knit a sweater….or 10.

NASA warns that participants will lose between 1% and 2% of their bone mass for each month they participate in the study, and that mass may never be regained.

Would it be worth $5,000?