Fact
The zipper would not have become the success it did if it hadn't been for world war one. Originally, it wasn't used on clothing but on money belts that the amercian solders brought to europe. .. More >>
Fact
The fuzz on a tennis ball is intentionally included as a way to give the ball some definite action when it hits the court. It also slows the flight of the ball through the air. .. More >>