Can you listen to an iPod using ear buds in a vacuum?

Since there’s no air in space, there can be no sound waves. My student would like to propose an imaginary scenario: He is floating in space (ignoring that there’s no oxygen and subzero temp) with his iPod in. Can he hear it? I said no, because you’d still need air between the earbud and his eardrum for the sound waves to travel, but we’d like to hear it from a scientist.
Are the blood brain barrier and the availability of glucose the ONLY reasons the brain uses glucose almost exclusively?
There are certain kinds of food that I like and some that I dislike, just like everybody else. But from an evolutionary standpoint, it seems like we shouldn't be turning our noses up at anything that helps us survive, nor should we have differing tastes than other people living in the same environment. Why would we develop a distaste for certain foods?
For how long do macrophages dock with helper T cells?
I've read that the (whole) brain consumes 20% of the total body energy expenditure at rest. How much energy do the the different areas of the brain consume for various tasks such as higher executive functioning More specifically, how can I find out about the varying metabolic requirements of different executive functions (goal related behavior) such as response inhibition, prioritizing, reasoning and scenario planning (etc) vs. lower level (limbic) tasks? Thanks.
I am watching the fascinating HHMI 2008 Holiday Lecture " Making Your Mind". Our experiences have components of our various senses. If each sensory component is a neural circuit, would there be some form of indexing to link the various circuits? Could you recommend an introductory book/article on the subject?
How fast would a moving object have to move in order to be invisible to the naked eye? Could Dash from “The Incredibles” really run so fast we could not see him?
When we lift an object or are applying stress on any object, in that case there's no actual movement. And according to sliding filament theory, energy is used when cross bridges are being formed; then, in the above-mentioned case, is there repeated formation and breaking of cross bridges during that time? Otherwise, how do we account for energy loss and exhaustion?
Do our cells respond to gravity? If so, how?
Why do we hear the ocean when we put a shell to our ear?