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Today in my eco-devo class we asked the question, "Why do we get old?". Student answers, a list:
• Time
• Methylation/acetylation
• Accumulation of damage
• Environmental damage
• IGF pathway
• Down regulation
• Mutations
• Stem cell depletion
• Competition
• Chance imperfections
• Invisible to selection
Always good to remind the young'uns of their inevitable fate.
@pzmyers Carpe Diem. Seize the day, boys and girls and others.
@elronxenu Doom awaits. Do it before your horrible unpleasant death.
I like to give my students uplifting messages.