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00:02:29
Music is more than meets the ears directly. Just as no sound exists in a vacuum, every space sculpts the sound within it. Like a site-specific equalizer, reflections, absorption, and resonances combine to give each venue a unique acoustic stamp. A subway tunnel is “live” space, rich with reverberations that trap and reflect sound in a well of hard tile. True to their name, “dead” spaces do nothing: The only sound heard is what travels directly from instrument to ear. An open field is the ultimate dead space. As you follow this wandering riff, listen to the changes wrought by environment. Distance is also a factor here—the sound you hear is recorded from the camera’s vantage. Which spaces sound live? Which sound dead? Do the acoustic changes affect the feeling of the music? Saxophonist Michael Pearce plays with the Highwater Blues Band in the San Francisco Bay Area.

1:00:11
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week's "secret" ingredient - Valentine gifts!

00:45:44
NASA's Mars Exploration Rovers, Spirit and Opportunity, have long outlived their life expectancy of three months. Join us as we sum up the rover data and explain how this information changes our view of Mars.

1:01:08
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week’s “secret” ingredient- carbohydrates!

00:29:21
We update on the week's exciting events on Mars and talk about what NASA has planned for future missions to the Red Planet.

00:23:48
How do JPL scientists and engineers talk to the MERs and how do we receive those amazing pictures in return? Find out how, and get the latest updates in this webcast.

00:31:00
With two rovers on Mars, we update you on the latest findings. This week, hear (and see!) more about a tool called Mini-TES, which helps us learn about rocks on Mars.

00:38:00
With two rovers on Mars, we'll update you on all the latest findings. This week, learn more about the Rock Abrasion Tool (RAT).

00:39:50
With two rovers on Mars, we'll update you on the latest findings. This week we hear about Spirit Rover's memory problems, the possibility of water on Mars, and about other missions to the Red Planet.

00:55:00
Two rovers are set to land on Mars during NASA’s Exploration Rover mission. The second, Opportunity, should land today. We’ll review the Exploration Rover mission thus far.