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Found this sound quiz online. Might be worth mining for questions at some point.

Kelly and astronaut Terry Virts discussed those things and more in one of at least four video chats TIME will conduct with the ISS during our exclusive Year in Space coverage. Phoning the station is not easy. It takes days of planning and at least an hour of sound checks before the uplink is made, and then long delays as questions and answers are relayed back and forth. It makes ordinary conversation a challenge.

Still, even in the 14 minutes the connection lasted-during which the station passed over Canada, the Great Lakes, Minneapolis, Denver, and Southern California-Kelly and Virts were surprisingly open, sharing their feelings about both the camaraderie and the sublime loneliness of being where they are. Kelly especially must be mindful of those feelings as he faces 10 more months of circling the Earth, while his family and friends and everything he knows lie 250 miles below him.

In an interview with the Daily Telegraph, Mr Baumgartner, who became the first man to break the sound barrier after leaping from 128,100ft above the Earth almost two weeks ago, urged the US Government to divert the money it spends on Mars toon environmental projects on Earth.
"A lot of guys they are talking about landing on Mars," he said. "Because [they say] it is so important to land on Mars because we would learn a lot more about our planet here, our Earth, by going to Mars which actually makes no sense to me because we know a lot about Earth and we still treat our planet, which is very fragile, in a really bad way.
"So I think we should perhaps spend all the money [which is] going to Mars to learn about Earth. I mean, you cannot send people there because it is just too far away. That little knowledge we get from Mars I don't think it does make sense."

"The short version, A tone outside the audible range of hearing for most people over the age of 30. This means that you can get phone calls and receive text messages in class or school without teachers hearing it. For more in-depth information on how the mosquito ringtone works, please see the Mosquito RingTone FAQ. For information on how to get the ringtone on to your phone, see our Mosquito Ringtone how-to Guide."

A neat ASAP video that explains why people lose their hearing over time. Also does a nice job showing the connection between frequency and pitch.

A great example of a Rube Goldberg machine. Ask students to think metaphorically -- how is the ear similar to and/or different from a Rube Goldberg machine.