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The drinking water provided for San Francisco and many nearby communities is among the purest in the world. Located high in the Sierras, more than 200 miles away, Hetch Hetchy reservoir holds most of this water which is fed by springtime snowmelt via the Tuolumne River. The system for delivering that water is almost entirely gravity fed, requiring almost no fossil fuel consumption to move water from the mountains to the tap. Take an exclusive tour with the San Francisco Public Utilities Commission (SFPUC) as they lead us through this unique system and address the current drought and how to conserve water.

Senior Exploratorium scientist, Paul Doherty, unlocks the mystery behind the corrosive dust that coats the Black Rock Desert.

Ice Stories correspondent Kelly Carroll reports from a storm at Tango 1 Camp, a remote camp deep in the Transantarctic Mountains.

They are many ways that people commute to work in the morning — some by car, or bus, or maybe walk or ride a bike. Getting to work in Antarctica can be just as varied. One of them is by helicopter. This footage was shot during a trip to Westhaven Nunatak, Antarctica.