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00:20:24
Learn how the mix of saltwater and freshwater in the San Francisco Bay affects its diverse ecosystems with John Largier, professor of coastal oceanography at the University of California, Davis.

00:38:13
Essential, explosive sodium is a soft, silvery alkali metal that roils in water, releasing clouds of hydrogen gas that fan its yellow flames. It reacts with most elements, and is naturally found only in compounds, such as sodium chloride, or common salt. Ancient Egyptians knew sodium from natron, a mix of salts prized for cleaning, personal hygiene, and preservation, particularly in mummification. Humphry Davy first isolated the element from caustic soda in 1807, naming it sodium; Jakob Berzelius preferred natrium, hence its symbol (Na). As a metal, liquid sodium cools nuclear reactors, and sodium-vapor lamps bathe streets at night in yellow, monochromatic light.

00:14:00
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.

00:01:38
Watch the Exploratorium's construction process from December 2010 to November 2012 in under two minutes. Come see for yourself—doors open at Pier 15 on April 17, 2013. http://press.exploratorium.edu/exploratoriums-net-zero-energy-goal-for-new-waterfront-home-2013/ Images courtesy of Ken Murphy. Music by Wayne Grim.

00:30:00
Tardigrades are amazing creatures that can withstand the most extreme conditions on Earth, as well as the vacuum of space! This unique and charismatic animal has the ability to survive in a variety of situations. In today's program, Exploratorium scientist Karen Kalumuck will continue our programming about life in extreme environments as it relates to the search for 'habitability' on Mars.

00:30:00
Why is water, or evidence of water, so important to the Mars missions? Join Exploratorium scientists Ron Hipschman and Karen Kalumuck as they examine water as one of the building blocks for life and what previous Mars missions have discovered about water on the red planet.

00:01:44
Take a look at the construction at Piers 15 and 17 from a different vantage point. This past August we recorded video of the Exploratorium's new home from a boat about 100 yards off the back of the piers.

00:02:48
The Exploratorium crew got the opportunity to enjoy a bird's eye view of the Black Rock desert. Join us as we investigate the challenges of navigating density altitude in this extreme climate.

00:03:20
We went and talked with the folks who ran the Microzoo camp at Burning Man 2010, and learned about critters in extreme environments.

00:01:27
Would you drink from a water fountain fashioned from an actual (but unused!) toilet? Watch museum visitors experience the tension between reason and emotion while playing with this unusual Mind area exhibit, aptly named "Sip of Conflict."