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00:01:54
In this video, Exploratorium Senior Scientist Paul Doherty explains why we don't have a total solar eclipse every month. A total solar eclipse happens when the moon crosses between the sun and Earth and casts its shadow onto our planet. But the orbit of the moon is tilted relative to the orbit of the Earth around the sun, so the moon often passes below or above Earth. At those times, it does not cross the line between the sun and the Earth, and therefore does not create a solar eclipse. There are just two times a year in the Earth's orbit when there is a possibility of a total solar eclipse.

00:03:45
Join Exploratorium astronomer Isabel Hawkins, and Exploratorium educator Liliana Blanco as they explain the celestial mechanics of a total solar eclipse. Through demonstrations, they show how the moon, sun, and Earth align to create the cosmic coincidence that we see as a total solar eclipse.

00:02:25
The Exploratorium is sending a production crew thousands of miles by plane and by boat to Woleai, Micronesia, to broadcast a solar eclipse live to the world. Many factors went into choosing a destination for the broadcast. Executive Producer Robyn Higdon looked along the path of totality for this eclipse, which will start in Indonesia and sweep across the Pacific Ocean, to find a location with good weather predictions and solid land for setting up the telescopes. The Woleai Atoll in Micronesia was the perfect choice. Tune in on March 8th at 5:00 p.m. PST to watch the live broadcast!

00:01:49
There are many ways that you can safely enjoy a partial or total solar eclipse using items from around your house! Dr. Paul Doherty will show you a few of the easiest methods for safe solar viewing.

00:00:45
On March 8, 2016, 5pm PST the Exploratorium will present a live webcast of the total solar eclipse in Micronesia. Join us here online or in person at the Exploratorium.

00:30:20
Recorded live at the Exploratorium in 2015. A noted foe of tooth decay, fluoride is added to most toothpaste, as well as our public water supply—a fact attacked by numerous conspiracy theories. Find out more about this controversial compound from Howard Pollick, Director of the Dental Public Health Residency Program at the University of California, San Francisco, and discover why elemental fluorine is considered to be completely dangerous, if not deadly.

00:02:23
Science, history, and art converge in this whimsical tribute to San Francisco’s 1915 World’s Fair, which is celebrating its centennial this year. Lost landscapes from the Fair (including the Exploratorium’s former home, the Palace of Fine Arts) become the backdrop for spectral encounters. Are the spirits of fairgoers getting restless? Museum visitors who dared to enter the Black Box interacted with ethereal forces and became part of a world of ghostly apparitions that sprung to life. Just in time for Halloween, Visible Spectres took as its cue the illusion technique known as Pepper’s ghost, used in theaters, haunted houses, sideshows, and magic tricks. Do YOU see ghosts? Kerry Laitala is an award-winning moving-image artist who uses analog, digital, and hybrid forms to investigate the ways in which media influences culture. She considers this approach to making art as a type of media archeology. Laitala’s work resides at the crossroads of science, history, and technology. Her uncanny approach to evolving systems of belief manifests through an array of media including films, videos, installations, photographic works, performances, and kinetic sculpture. She studied photography and film at the Massachusetts College of Art and received her Master in Film from the San Francisco Art Institute. Laitala’s 2015 City Luminous series encompasses seven separate works (and counting), spanning the realms of installation, multi-projector performance, photography, and single-channel film, shown thus far at the Palace of Fine Arts, the San Francisco Art Institute, the California Historical Society, and in solo shows at Oddball Films and Shapeshifters Cinema. Elements of The City Luminous series have been funded by a Special Projects Grant from the Princess Grace Foundation, San Francisco Arts Commission Grant, Yerba Buena Benefit District grant, California Historical Society, and Maurice Kanbar.

00:00:34
Tune in to Resonance, a series of live performances and conversations amplifying unique frequencies of musical possibility. Season 3 begins December 10 with music from the Arab world presented by composer and performer A.J. Racy. For more information - http://www.exploratorium.edu/arts/resonance

00:06:25
Millions of people around the world struggle to live with corneal blindness—the loss of sight caused by damage to the surface of the eye. It's a treatable condition with a clear solution: a corneal transplant. This Science in the City episode will highlight the work SightLife is doing to help end corneal blindness by making transplants possible. The video will cover the whole process from corneal recovery from a donor to corneal transplant surgery.

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.