Security video shows a group of middle school students who were able to stop their school bus from crashing after the driver experienced a medical emergency on a four-lane highway in Mississippi. The bus had just left the school with about 40 children on board when Leah Taylor, 46, had an asthma attack. She reached for her medication but blacked out before she could get it. In a matter of seconds, the students sprang into action. #mississippi #caughtoncamera #surveillancevideo #school #middleschool