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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.

On the cliffs above San Francisco's Ocean Beach perches a landmark observatory���a giant camera obscura. Step inside with Robert Tacchetto and see how this centuries-old technology creates enchanting images of the outside world.

Virtual worlds have physics. In this exhibit a visitor knocks over a small domino which knocks over a larger domino and so on down an exponentially growing line of dominoes which all the while obey the laws of physics.

Virtual Worlds are social spaces--music and dancing are ubiquitous, and so we made an exhibit that mixes a unique color for every avatar into a blend of colors when they dance together.

Watch highlights from our live webcasts with the E/V Nautilus as she explored the Mediterranean and Black Seas searching for shipwreck, deep sea vents and the communities of organisms that live in these extreme environments.

Join the Exploratorium for our final webcast with researchers on board the Nautilus. We discuss the highlights of their three month expedition to the Mediterranean and Black Seas, as well as to the eastern Atlantic Ocean. Learn about hydrothermal vents, organisms living in extreme environments and ancient shipwrecks.

The Nautilus has discovered several well-preserved shipwrecks on their mission, from ancient Greek trading vessels to modern sailboats. Join us as we talk with chief scientist Katy Croff Bell live aboard the Nautilus and see the latest video of their discoveries.

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.

Located in the Atlantic Ocean off the coast of Portugal, the seamounts of Gorringe Bank rise nearly 5000 meters from the sea floor -- as tall as Europe's Alps. Join us as we talk live with scientists aboard the Nautilus as they explore these geologically active and biologically rich submarine mountains.

This After Dark, the Exploratorium hit repeat on favorite memories. Guests explored the fascinating worlds of reminiscence and repetition���and then backwards skated through their own nostalgia on our temporary roller rink.