what if we had 35% oxygen in the atmosphere? . #brain #human #humanity #edu

what if humans lived when the air had 35% oxygen? 300 million years ago that was the real number and today we only breathe 21% which means the air back then was almost double what your lungs get right now that extra oxygen changed everything about how life on earth was built in sex breathe through tiny tubes instead of lust so oxygen can only travel a short distance into their bodies which is exactly why bugs are small today but with 35% oxygen that limit disappeared dragonflies grew wings that stretched over two feet across and millipedes reached two and a half meters long if humans were born into that atmosphere our muscles would produce energy at a much higher rate our recovery would be faster our brains would be flooded with more fuel and we would be physically stronger than any human alive today but there is a reason nature took that oxygen away oxygen is what keeps you alive and it is also the exact thing that ages you because every time your cells use it they produce free radicals which damage your DNA your proteins and your cell membranes scientists call this oxidative stress and it is one of the leading explanations for why we age and die at all