“The individual doesn’t matter. You, Dad, in the large scheme of things, don’t matter. I, Dad, don’t matter. We’re vectors on the grids of cellular life. We carry 10 to 12 genes with mutations that are potentially lethal. These mutations are passed on to our children—you to me, me to Natalie. Aging followed by death is the price we pay for the immortality of our genes. You find this information soul-killing; I find it thrilling, liberating. Life, in my view, is simple, tragic, and eerily beautiful.”