Award-winning science writer Rowan Jacobsen dismantles the sunscreen-obsessed consensus, revealing that moderate sun exposure reduces cardiovascular disease, improves cognition, and extends lifespan—while dermatologists reject data showing benefits outside their skin-cancer focus. His book 'In Defense of Sunlight' challenges 40 years of institutionalized fear with surprising evidence. Sunlight triggers opioid release in the brain, improves cognition, lowers blood pressure, and extends lifespan overall—benefits that outweigh skin cancer risk for most people when exposure is moderate and not through burning.