Astronauts aboard the space shuttle Columbia had their heads spinning, literally. As part of a series of space-based neurological experiments, they took turns in a spinning chair while IR video cameras tracked their eye movements.
NASA researchers hope the experiments will provide clues to how the body's balance-sensing organs feed information to the brain. In the absence of gravity, astronauts were unlikely to suffer motion sickness. The experiments were part of a $99 million research mission lasting a little more than two weeks.