Give yourself a 15-minute energy boost pre- or post-flight and inhale oxygen infused with aromas such as lavender or eucalyptus.

FORBES: The Best International Airports For Layovers

Workers operate machinery from inside pressurized cabins or inhale from oxygen canisters to stave off the worst effects of altitude sickness.

CNN: Telescope set to reveal 'Big Bang'

As they desperately try to breathe and pull in more oxygen, they may inhale too much salt water into their lungs and drown.

CNN: Are polar bear plunges good for you?