Hey Reader! My grandfather was fond of telling me, “Knowledge is power.” He’d ask, “What’s the strongest muscle in the body?” And to his delight, I’d shout out, “The brain!” But one day I learned that the brain isn’t a muscle, it’s an organ. The next time Grandpa asked me about the strongest muscle, I told him it was probably the jaw. When pressed, I added that the thigh and buttocks were also very strong muscles. “It’s the brain!” he said angrily. I patiently explained that the brain is an...