@sciencelowusa: Credits: Zenn on Youtube Tonight, when you flip a light switch, you probably won't think twice about it. But for 99.9% of human history, that switch didn't exist. For over 300,000 years, your ancestors spent half their lives in a darkness so thick they couldn't see their own hands-and it turns out, that darkness made us who we are. In this video, we explore how the discovery of fire didn't just keep us safe from predators; it literally restructured the human brain. We dive into the fascinating "lost history" of sleep, revealing that the eight-hour block we struggle to achieve today is actually a modern invention. #humanhistory #Sleepscience #evolution #thegreatdarkness #anthropology

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Friday 29 May 2026 19:06:51 GMT