“The knack of flying is learning how to throw yourself at the ground and miss” With these words, Douglas Adams helpfully explained concept of flying in his Hitchhiker’s Guide to the Galaxy. But the ground is really big, and, as the Tick so sagely noted, “Gravity is a harsh mistress.” So herein contained is my handy-dandy explanation of how you can impress your friends and family by throwing yourself at the ground and missing: Step one, throw yourself at the ground. Luckily, this is really easy thanks to gravity, which will pull you down to the ground at an acceleration…