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Welcome to the science podcast for October 3, 2014.

I'm Sarah Crespi.

In this week's show, we start with a roundup of daily news stories,

and then we hear from David Sandwell and why it might be best to just map the bottom of the ocean from outer space.

Support for the science podcast is provided by AAAS,

the American Association for the Advancement of Science,

advancing science, engineering, and innovation throughout the world

for the benefit of all people.

AAAS, the Science Society at www.aAAAS.org. Now we have GAU, an intern for our daily news site.

She's here to talk about some recent online stories.

I'm Sarah Crespi.

First up, we have a story on how what we

can't hear might actually hurt us. Humans can hear sounds with frequencies between 20 hertz and 20,000

hertz, but sound waves outside that range still can interact with the ear, even though it's not

interpreted as sounds all the way into our brains. The question

before us today is, can these seemingly silent sounds hurt us? So, Gia, let's start with the source

...