Few stories in evolutionary biology reach across hundreds of millions of years and still leave fingerprints on the cells inside your body today. For more than one hundred and sixty four million years, the ancestors of every living mammal survived under the dominance of the dinosaurs. According to the fascinating Longevity Bottleneck Hypothesis, that long period of evolutionary pressure may have reshaped mammalian biology in ways that still influence aging, cancer risk, DNA repair, regeneration, and lifespan today. In this documentary, we follow a remarkable scientific trail through fossils, genetics, comparative biology, aging research, and evolutionary history. Discover why mammals lost the photolyase enzyme that many other vertebrates still possess, how prolonged nocturnal life may have altered our biology, why reptiles and amphibians often age differently from mammals, and what modern longevity science is trying to recover. Along the way, we explore early mammals such as Morganucodon and Repenomamus, the rise of dinosaur dominance, the nocturnal bottleneck, color vision loss, DNA repair systems, cancer biology, regeneration, the evolution of the mammalian brain, photolyase restoration experiments, long-lived animals like bowhead whales and naked mole-rats, and the growing scientific effort to understand the true origins of aging. 🔬 Topics covered: • The Longevity Bottleneck Hypothesis • Early mammal evolution during the age of dinosaurs • Morganucodon, Hadrocodium, and Repenomamus • The nocturnal bottleneck and mammalian origins • Color vision loss in mammals • Photolyase and DNA repair • Aging biology and cancer risk • Regeneration in salamanders and axolotls • Bowhead whales, naked mole-rats, bats, and longevity • Comparative genomics and lifespan research • The evolution of the mammalian brain • The Cretaceous Paleogene extinction • Modern anti-aging research and longevity science • Senolytics, rapamycin, and cellular maintenance • Evolutionary medicine and deep-time biology If you enjoy thoughtful science documentaries, deep evolutionary history, paleontology, genetics, and discoveries that connect the distant past to everyday life, please like the video, subscribe, and join us for more journeys through the history of life on Earth. 🦴🧬🌎 Become a supporter of this podcast: https://www.spreaker.com/podcast/snoozy-science--7446878/support. This episode includes AI-generated content.