Mitochondrial DNA is in higher concentration, lasts longer, and can be extracted from bones.
Part of the problem with the discovery of the so-called breast-cancer genes was that physicians wrongly told women that had the genetic changes associated with the genes that they had a 99% chance of getting breast cancer. Turns out all women that have these genetic changes don't get breast cancer.
There are still so many questions to answer about the workings of the human body and, most mysterious of all, it is influenced by our state of mind.
As the Industrial Age is drawing to a close, I think that we're witnessing the dawn of the era of biological design.
The environment has fallen to the wayside in politics.
Sometime in the future, I am a hundred percent certain scientists will sit down at a computer terminal, design what they want the organism to do, and build it.