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00:19:43
Recorded live at the Exploratorium 2015 Helium is the second most abundant element in the universe. Then why is there a global helium shortage? Follow the trail of our spendthrift affair with this elusive noble gas, and find out why its future remains up in the air. Learn about helium’s many uses, from cooling magnets in MRI machines to enabling deep-sea divers to safely breathe under pressure.

00:25:23
Featuring: A People's History of the Periodic Table with Paul Stepahin

00:30:00
Join us for a live webcast with senior scientist Paul Doherty to discuss breaking news about the Rosetta Mission! The European Space Agency’s Rosetta mission deployed its lander, Philae, to the surface of Comet 67P/Churyumov–Gerasimenko on November 12. 2014. Philae’s landing site, currently known as Site J, is located on the smaller of the comet’s two ‘lobes’, with a backup site on the larger lobe. The sites were selected just six weeks after Rosetta arrived at the comet on August 6, following its 10-year journey through the Solar System.

00:23:52
Join us for a live chat with educators and scientists aboard the Exploration Vessel Nautilus, which is studying an active volcano beneath the Caribbean Sea. Learn about the excitement of deep-sea exploration, and find out whether the researchers have had to dodge any underwater volcanic eruptions.

00:49:00
Join us as Rosetta moves ever closer to Comet 67P/Churyumov-Gerasimenko’s nucleus to map potential sites for a November landing.

00:30:00
Cheer on the competitors in this zany science cook-off, where teachers compete before a live webcast audience for the sought-after title, "Iron Science Teacher."

00:50:00
Cheer on the competitors in this zany science cook-off, where teachers compete before a live webcast audience for the sought-after title, "Iron Science Teacher."

00:50:00
Cheer on the competitors in this zany science cook-off, where teachers compete before a live audience at the Exploratorium for the sought-after title, "Iron Science Teacher." This week's ingredients can be found in your breakfast!

00:30:00
The most difficult phase of the Rosetta mission is the final rendezvous with the fast-moving comet. Learn what steps the ESA scientists and engineers are taking to ensure a successful landing for November 2014.

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.