Why does a knuckleball flutter? Why do belly flops hurt so much? Why would a quarterback prefer a deflated football?

Here are 54 all-star experiments that demonstrate the scientific principles powering a wide variety of sports and activities--and offer insights that can help you improve your own athletic skills. How does a black belt karate chop her way through a stack of bricks? Use Popsicle sticks to understand why it's possible and learn the role played by Newton's second law of motion. Does LeBron James really float through the air on the way to a dunk? Use a tennis ball, a...