DTH Humans are not alone in facing the ultimate reckoning, but we’re the only species–as far as we know–who spends its whole life knowing death is coming. A clam dredged from the ocean off Iceland in 2006–and inadvertently killed by the scientists who discovered it–carried growth lines on its shell indicating it had been around since 1499. That was enough time for 185,055 generations of mayfly–which live as little as a day–to come and go. Neither clam nor fly gave a thought to that mortal math.

Humans are not alone in facing the ultimate reckoning, but we’re the only species–as far as we know–who spends its whole life knowing death is coming. A clam dredged from the ocean off Iceland in 2006–and inadvertently killed by the scientists who discovered it–carried growth lines on its shell indicating it had been around since 1499. That was enough time for 185,055 generations of mayfly–which live as little as a day–to come and go. Neither clam nor fly gave a thought to that mortal math.