One comment...Wall Street doesn't have a choke-hold on technical talent. For instance, most (I'm confident to say above 90%) people recruited by banking programs cannot write a single line of code. Excel macros don't count.
I would say that depends on whether or not you expect any income to start and also if you are assuming any liability with your side project. Registering as a company will help shield you from this (at least in the U.S.).
Mistaken paternity would be readily apparent from a 23andMe test. There is a section where they compare family DNA, and a child is expected to share 50% of their chromosomal segments with their father. Of course, both child and parent would have to be tested.
I agree completely, the disease predispositions in the 23andMe service fall far from being of any value. http://Navigenics.com and http://www.deCODEme.com do a better job at this.
I suppose mistaken ancestry is a very "American" fear (if one at all), although I can think of other countries (like Japan) where any "surprises" in ancestry might not be so hot.
Very good point, I wasn't saying it totally defeats all objections to gay marriage, just the specific reproductive argument against it. But I agree, politics does tend to detract from science.