“Multiply your age by 0.9. If you’re forty, you’ve spent thirty-six of your years indoors. About a third of that is time spent sleeping, but still. Most humans who live in the United States and Europe spend more time indoors than some species of whale spend underwater. It may be that the minutes you spent walking to and from the subway on a Tuesday in January tallied up to fewer minutes than a whale spent on the surface, filling its lungs, that same day.” – The New Yorker