My own life has in some ways been a decades-long tour of the sibling experience. I have full sibs, I have half-sibs, and for a time I had step-sibs. – Jeffrey Kluger
There are a lot of downsides to being male. We age faster and die younger. But give us this: were lifetime baby-making machines. Womens reproductive abilities start to wane when theyre as young as 35. Men? Were good to go pretty much till were dead. – Jeffrey Kluger

