"Human beings have existed for 250,000 years; during that time, 90 billion individuals have lived and died. You’re one of 6.5 billion people now on the planet, and 99.9 percent of your genes are the exact same as everyone else’s. The difference is in the remaining 0.1 percent - one nucleotide base in every 1,000."
— David Shields, The Thing About Life is That One Day You’ll Be Dead