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00:21:08
Astrophysicist Paul Coleman and expert ocean navigator Kalepa Baybayan visited the Exploratorium as advisors to our Polynesian Navigation project—a large-scale Web resource (launching April 2010) that will feature the astounding navigation practices of the Pacific Islanders, who were expertly navigating the Pacific thousands of years before the arrival of Europeans. Paul Coleman works at the University of Hawaii Institute for Astronomy, where he concentrates on the large-scale structure of the universe. Kalepa Baybayan is an expert navigator who mentors Hawaiian youth in native navigation practices. Both men are native Hawaiians. We spoke with them about traditional navigation practices, the balance between science and spirituality from a native perspective, and the benefits of being grounded in one’s culture.

00:22:45
Join Exploratorium Senior Scientist Paul Doherty and visiting scientist Alfredo Mateus for an exploration of hands-on demos. In today's webcast, Paul and Alfredo will be looking at a voice activated chemical reaction and what happens when you heat plastic in water!

00:04:48
Sarah Santos and Jeremy Rector demonstrate two ways to make ferrofluid during a live Webcast of the Exploratorium's Iron Science Teacher. Watch the whole episode (type "oil" in the search box), along with many other episodes of Iron Science Teacher at www.exploratorium.edu/tv

00:00:44
This is a time-lapse movie of a chain reaction activity presented at the Exploratorium booth during Maker Faire 2009. Participants were asked to build a portion of a collective chain reaction contraption, which was set off twice during the day. Photos were taken every 30 seconds and then joined in a 24 fps movie.

00:00:36
This is a time-lapse movie of a chain reaction activity presented at the Exploratorium booth during Maker Faire 2009. Participants were asked to build a portion of a collective chain reaction contraption, which was set off twice during the day. Photos were taken every 30 seconds and then joined in a 24 fps movie.

00:16:24
In conjunction with this summer's special exhibition Reflections, Exploratorium Senior Scientist Paul Doherty joins us for a hands-on Webcast. What effect does looking through two mirrors have on an image? Or three mirrors?

00:09:29
Newton’s laws were never so tasty. Exploratorium staff educator Don Rathjen demonstrates concepts about force using a file folder and a marshmallow.

00:13:23
The Exploratorium's Playful Invention and Exploration (PIE) department is inviting the public to create components of a multi-step chain reaction at Bay Area Maker Faire, 2009. Watch live as each maker's machine sets off the next, culminating in a grand finale!

00:16:50
For the second time, the Exploratorium's Playful Invention and Exploration (PIE) department is inviting the public to create components of a multi-step chain reaction at Bay Area Maker Faire, 2009. Watch live as each maker's machine sets off the next, culminating in a grand finale!

00:07:42
How big does a mirror have to be for you to see yourself in it? Exploratorium staff physicist Thomas Humphrey describes an activity you can use in your classroom to investigate simple optics.