rarely do people donate sperm or eggs or even blood out of good will, and those (mostly the former) are relatively freeflowing and without risk. You usually have to coerce somebody to do it. The same will apply to Kidneys. Personally, I'm rather fond of both of my Kidneys, I even have names for them (not really.) To rip one out? Maybe you should be greasing the gears a bit by offering cash and a cup of orange juice for those that donate a kidney.

Another easier solution, is the wonderful cure all magic gel that is Stem Cells. We could repair kidneys, hopefully fixing the problem or atleast prolonging the person long enough till a transplant is available. Or with even more advanced stem cell research, we could actually GROW a new kidney, in a lab.

Why is music wired to be so important to us, and even for animals? 

If he's a clone, does that mean in Star Trek Kirk died like 300 times?

And if the person is a clone, realistically, would this still be considered as a "reasonable" method of travel? Would science willingly allow the mass suicides of thousands of people for means of "convienant" transportation?

Theres so much mysteries in our world. Paranormal activity, reincarnation, seers and communication with the dead. Traits passed on from people who donated organs, etc. Its hard to say what happens, but when it comes down to it, we know what we ARE. We are a collection of electronics and photons, swirling around. We're completely energy, passing a temporary illusion of solid matter. Energy is never created nor destroyed. All the achievements of science can only pinpoint where our mind operates, but not what makes it operate. Our true essence has never been found by science.