Daniel and Kelly’s Extraordinary Universe Why do we age? (featuring Dr. Venki Ramakrishnan)
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Oct 9, 2025 
Dr. Venki Ramakrishnan, a Nobel Prize-winning structural biologist and author, explores the science of aging and its evolutionary roots. He defines aging as the gradual buildup of molecular damage rather than just the passage of time. Venki discusses intriguing concepts like why some organisms appear immortal, the role of telomeres in aging, and the limits of interventions like young blood transfusions. He emphasizes practical health tips, including diet and exercise, to improve healthspan, and speculates on aging in potential alien life.
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No True Immortals, Only Slow Agers
- Apparent biologically immortal species (hydra, immortal jellyfish) likely age extremely slowly rather than truly escape aging.
- Continuous regeneration via stem cells delays but does not perfectly prevent accumulating damage.
Evolution Prioritizes Reproduction Over Longevity
- Evolution favors reproductive fitness over individual longevity, creating trade-offs between growth and long-term maintenance.
- Traits beneficial early (e.g., anti-cancer mechanisms) can cause aging later in life.
Senescence Is An Anti‑Cancer Trade-Off
- Cellular senescence (cells that stop dividing) is an evolved anti-cancer response that accumulates and promotes inflammation as we age.
- Telomere shortening triggers this senescence by making chromosome ends look like DNA breaks.
