} The simple biological reason is that evolution is really good at having
} 'optimized' a human being (any creature, actually) to survive long
} enough to reproduce and raise their children. Since human children
} need 8-15 years of care to have (at least a reasonable) chance of
} survival on their own, and given that every human couple needs to have
} '2' children to keep the numbers constant and that the children needs
} to have a couple of years between them, a good lifespan target for a
} human is in the range of 30-40 years. However, from an evolutionary
} standpoint the optimization stops there and humans above the age of 40
} (or so) just get in the way. Eventually one of the critical parts
} (heart, lungs, disease control, etc) that got the human to an age of
} 40 just 'wears out' and death occurs.
} However, I think you are looking for an answer more like:
} First Supplicant: "Oracle, you are so awesome, that you make my feet
} hurt. Why do people have to die?"
} Oracle: "Great idea. From now on, humans live forever. NEXT!!!"
} First Supplicant: [Bows and exits stage left]
} Next Supplicant: [Enters from stage left] "Oh great and wonderful
} Oracle, How much wood would a woodchuck..."
} Oracle: "You miserable, insolent cur. TAKE THAT!!!" <<ZOT> [A bolt
} of highly charged plasma arcs towards the supplicant and strikes him
} on the chest].
} Next Supplicant: [Cringes, expecting the worst, but nothing happens.
} Slowly he straightens his back, brushes some dust off his jacket,
} and continues]. "er, chuck if a woodchuck..."
} Oracle: "What in tarnation?" <<ZOT>> <<ZOT>> <<ZOT>> <<ZZZOOOOTTTT>>
} Next Supplicant: [cringes yet again, but nothing happens]. "could
} Oracle: "I take it back. Humans don't live forever."
} Next Supplicant: [doesn't exist any more; has been replaced with a
} loose pile of dust and a whiff of smoke].
} Oracle: "I feel better already... NEXT!!!"
} So you see, death exists so that stupidity can be adequately