This fits in with what I saw in staff in astronomical facilities and was reporting to the management team: 10-14% Oxygen: Emotional upset, abnormal fatigue, disturbed respiration.

The fittest person survives! The fighting man succeeds! He who Fights to Fit, will Survive to Succeed!

Girls should be taught at school that giving birth to an unnaturally over-sized western baby that no longer fits down the birth canal may lead to a multitude of long term health problems.