saw an article in the newest (print) version of 'scientific
american'...there's active research underway regarding an alternative
theory of why people get seasick

the conventional explanation has to do with a disparity between what
the inner ear senses and what the eye sees.

however, there is a growing body of evidence from psychologists
showing that the movement of the body is responsible for seasickness,
and that by standing with your feet about 1.5 feet apart you can
significantly reduce seasickness by increasing the body's stability.