If you have ever been on a plane, you have been subjected to the flight attendant’s spiel about what to do if the cabin loses pressure. They explain that oxygen masks will fall from the ceiling and show you how to put them on. Every time, they remind you that if you are traveling with a child or someone else in need of assistance, you must be sure to put your mask on before you try to help anyone else. The implication is clear. If you don’t take care of yourself, then you won’t be able to care for anyone else. You’ll be lying unconscious in the aisle.