Mr. Brown and his wife said they had ridden out the tornado in a storm cellar, Iistening to the sound of screeching metal and smelling the odor of gas.

WSJ: After Oklahoma Tornadoes, Rescue Efforts Focus on Survivors

Other studies have concluded that people give off different body odors that correspond to certain emotional situations, but what hasn't been shown is whether other people become a little stressed after smelling the body odor from stressed people, Wysocki said.

CNN: Sweat may give off stress signals, study says