"The material world is necessarily temporary, and it is only a matter of how deep we are willing to look, how far into the past and future we are willing to consider, to understand this. If you don't believe me, look at the ruins of every society that has predated us on this planet. Remember that the matter that makes up our moon and planet is the dust of stars exploding in other galaxies. Remember that we can be partially made of stardust only because stars die. Death is a non-negotiable aspect of the pattern of life for most creatures we are aware of. (With the exception of immortal jellyfish, tardigrades, and turtles who don't come across humans.) For humans and most species we have encountered on Earth--and even for most celestial bodies--there is a life cycle that includes death."
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