How Did Ancient Humans Drink Water Without Dying?

If you drank a single cup of unfiltered river water today, you would likely spend the next five days in a hospital bed hooked to an IV drip. Yet for over two million years, early humans knelt beside decomposing animal carcasses, drank straight from muddy puddle basins, and swallowed water crawling with parasites—with zero filters, zero chlorine, and zero boiling pots. How did ancient humans survive drinking contaminated water without dying? In this video, we uncover the hidden evolutionary armor behind prehistoric survival: why human stomach acid shares the exact chemical pH of obligate scavengers like vultures and hyenas, the shocking 5-parts-per-trillion sensory superpower hidden in your nose, the Stone Age engineering of sand seep wells and inline plant straws, and how Upper Paleolithic hunter-gatherers purified water 20,000 years before the invention of ceramic pottery. Subscribe to Zero Point for weekly deep dives into ancient human survival, prehistory, and evolutionary science.