Top Highlights

• Within the last 100,000 years, humans then devised the bow and arrow, the spear-thrower (atlatl), harpoons, nets, blowguns, hunting dogs, poison-tipped arrows, and traps.63 Think of the weapons invented since that make it even easier and safer to kill from a distance.
• even if you are a highly active person, you probably spend more energy maintaining your body than doing stuff. Understandably, this fact seems counterintuitive. As I sit here writing these words, there is little visible evidence that every one of my body’s systems is working industriously to keep me alive apart from the fifteen to twenty gentle bre...
• nearly two-thirds of a person’s resting metabolism is spent on just three very expensive tissues: brain, liver, and muscle.
• If you are sitting while reading this, for every five breaths you take, one pays for your brain, another for your liver, a third for your muscles, and the last two pay for the rest of your body.
• Stated simply, we evolved to be as inactive as possible.