NASA and the European Space Agency are willing to pay 24 participants nearly $19,000 to spend 60 days in bed and monitored around the clock.   The 24 participants will be separated into two groups, but housed in a single room. Each person will be propped up at an incline with their feet above their head, reducing blood flow to the extremities, mimicking the effects of being in space. This could, however, lead to numbness and muscle deterioration.