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Hair does not know how long they have to grow. But they have a finite lifetime. After that they stop growing and they fall out. Also new hair is allways growing. The equilibrium is the terminal length where you think hair is no longer growing. Bodyhair...

When thinking about things being sticky or slick it's useful to think of the molecules as tiny little robots with magnetic grabber arms. Some materials have lots of arms and connect to each other well. Some materials have very few arms and don't have...

They do list ingredients, as required by (U.S.) law. CARBONATED WATER, HIGH FRUCTOSE CORN SYRUP, CARAMEL COLOR, PHOSPHORIC ACID, NATURAL FLAVORS, CAFFEINE. But the law does not require them to spell out exactly what all those "natural flavors" are...

Your body is a castle. Germs are invaders. Your castle has thick walls but needs gates so you can see out of it, take in supplies and get rid of rubbish. Gates are weak spots so get attacked more often. The throat is the most open to attack as it is...

They're kind of stuck. They'll keep moving down your throat but that feeling means that the pill hit the walls of your esophagus when they were too dry so it's harder for the esophagus to move the pill down. Think of it like trying to go down a water...