Water, water everywhere - but less than half of a percent of Earth's reserves are drinkable.
That's just one shocking fact that Neil deGrasse Tyson and five experts dropped at the 2015 Isaac Asimov Memorial Debate at the American Museum of Natural History, which focused on the surprising origins, scarcity, and value of water.
Before the event, Tech Insider joined a closed-door meeting with Tyson and the five experts.
Here are just a handful of facts that put water shortages like California's crippling drought into stark perspective on World Water Day (March 22).