This is funny, humans being kind and caring comes in last, people seem to believe the singularity is more probable. I'd have to say I agree, and this makes me laugh.

not necessarily. Perhaps older people who are late in life that want to help benefit humanity. Not that they would be lining up to volunteer, but certainly someone would. I would think its safe to assume if the did in fact contract HIV, they would probably get the best health care available to keep it in check for the rest of their lives.

And us Nuclear Engineers build payloads, which you love us for...

Sorry, wrong. The current light water reactors in the US run on up to 5% enriched U-235 (and cannot use anything higher due to regulation). For nuclear weapons it takes over 20% at least, usually over 90%. http://en.wikipedia.org/wiki/Enriched_uranium