Avoid Gravity News Today

Consciousness at a wedding. but wherever it happens, it can be bewildering, even terrifying. >> my heart started racing very fast. >> reporter: cathy chandler is a chronic fainter. and her doctor says its startling scenes like this that may hold clues to keeping her healthy. watch as astronaut heidi marie stephenshen collapses after returning from her first space mission. >> astronauts are very prone to fainting, dizziness. if youre in space, youre not using all your muscles, including your hear...