Why Biology Won't Let Us Live Forever

What if immortality is not the dream we think it is? This animated explainer breaks down aging at the cellular level, from telomeres and DNA damage to the hidden cost of metabolism. We explore why tiny animals burn through life quickly, why larger animals age more slowly, and why humans are a strange exception to the “billion heartbeats” rule. Then we go deeper into evolution: death may not be a flaw, but a feature that protects life itself. Subscribe for more animated science explainers.