pigrabbitbear writes: "Humans are pretty fragile. A bad break in your hip can mean surgery and months of rehab. That’s pretty bad, but what if you fall and break your hip on the Moon, or even Mars? You’d be hundreds of thousands or millions of miles from a fully stocked hospital and a surgeon with steady hands. There’s the option of doctor-assisted surgery from Earth — a fellow astronaut performing the surgery with remote assistance from a doctor via video link. But the lengthy communications delay make this a poor option anywhere further than the Moon.