There's a secret setting to change the direction your fan spins, and it could be the secret to a lower energy bill this ...

How to change the direction of a ceiling fan. Adjusting the fan's direction is very easy. Most fans have a tiny switch on the top that changes the direction. Adjust this, and you’re all set.

Today, we are discussing how helicopters can change direction in the air without spinning out of control. A century of innovation and improvements. Dana Neibert/Getty Images.