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00:14:00
Catch one of the After Dark: Sexplorations highlights from February 6, 2014! Watch as Exploratorium Biologists, Karli Woodward and Caitlin Johnson demonstrate a live sea urchin fertilization.

00:07:10
Seasonal cycles and winter storms bring extra-high "king tides" that can swamp coastal structures and habitats. What’s a coastal dweller to do? Take pictures! It’s no joke: Educators from the California King Tides Initiative explain how citizen snapshots can be of real value to researchers and policy makers.

00:04:05
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.

00:09:58
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.

00:27:35
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.

00:23:58
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.

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.

00:25:03
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.

00:03:53
Join Exploratorium educator Ken Finn as he unlocks the mystery behind the black sand (a.k.a. magnetite) at Ocean Beach. This piece explores the origin of magnetite in the Sierra Nevada mountains, its journey down the Sacramento and San Joaquin rivers to the Bay, and the interesting physical properties of this mineral, plus some fun things you can do with it.

00:01:04
See how patterns of light change throughout the day at Chaco, and hear G.B. Cornucopia and Shelly Valdez share their impressions of the phenomena of light cycles in Chaco Canyon.