CALLING ALL KIDS: POP QUIZ! HOW MANY DAYS IN YOUR LIFETIME DO YOU GET TO ENJOY JUST BEING A KID? 20.000? 30.000 maybe? Nope, way off. The answer is 6.570. That's it: 6.570 days from the day you enter this world until the day you're a "responsible" adult. In the grand scheme of things, that's not a lot of time. So come on, let's make the most of it! In your hands you hold more than too awe…