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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.

Join the Exploratorium's very own Ken Finn as he demonstrates fun activities, mixing up science with items found around the house.

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.

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.

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.

Join the Exploratorium crew on a visit to the Scripps Institution of Oceanography, where we will learn more about the ecological impact of plastic debris in the North Pacific Gyre. To learn more about marine debris visit: http://www.exploratorium.edu/tv/index.php?project=110&program=1301&type=clip

Weather plays a large role in sailing! Join us as we pay a visit to the National Weather Service station in San Diego to catch a glimpse into the future weather patterns that will effect the America's Cup Races.

There are green sea turtles in San Diego Bay? Where did they come from? Do they really live over 100 years? Why is it important for scientists to keep track of these giant creatures, and how on earth do they do it? In this interview with ecologist Tomoharu Eguchi (NOAA Marine Fisheries Service) and ecology graduate student Sheila Madrak, we meet the sea turtles and explore these 'big' questions.

The Southern California Coastal Ocean Observing System (http://sccoos.org/) gathers live data about winds, waves, surface currents, temperature, and water quality, and makes it available to everyone. In this piece, Oceanographer Art Miller tells us about this system, and about how America's Cup sailors can use this kind of data and modeling to improve their race performances. To access wind modeling data, visit: http://www.sccoos.org/data/observations/

How can a wind-powered sailboat move faster than the wind? Why do the America's Cup sails look like airplane wings? With the beginner in mind, Exploratorium senior scientist Paul Doherty introduces the basic physics of sailing and sail design.