It's just amazing that DNA survived the ravages of such a long time, and even more amazing that human technology can use this to identify relatives so far apart in time or space. And then the wonders of DNA itself, what an absolutely mind-blowing bit of nature. Thinking about the structure of the universe, from quarks and fundamental particles to the large scale structures seen through telescopes, that's just wild. And then there's the ability of our mind to perceive and imagine and wonder about this .... no words.