"No matter what you eat, how much you exercise, how resilient your genes are, how skinny or young or wise you are, none of it matters if you're not breathing properly. There is nothing more essential to our health and wellbeing than breathing: take air in, let it out, repeat 25,000 times a day. Yet, as a species, humans have lost the ability to breathe correctly, with grave consequences. Science journalist James Nestor travels the world to figure...