One thing sports like football, soccer, baseball, and golf have in common is that in order to play them you use shoes that have cleats in them.
When you run, hit, catch or throw, those cleats can tear up the turf and make holes in the ground. Well, a German designer named Daniel Wilhelms has developed a soccer cleat that is filled with fertilizer. Called the Naturistick, the cleat releases a dose of fertilizer with every step you take. This is an interesting concept that we may see evolve into other sports as a way to insure that our playing surfaces stay green and lush.
I don't know too much about them yet as the website is in German, but if you can read German then check out Daniel Wilhelms Naturistick.