How do you know which way the wind is blowing? Have you ever tried to lick your finger and stick it in the air, or observed trees and flowers blowing in a certain direction? These are pretty solid ways to measure wind, but when you're using wind to create enough electricity to power big buildings, you need to figure out better ways of measuring—and using—the power of the wind. Wind energy managers are in charge of this rather important task. They use science and technology to analyze wind speed and direction data from various wind farms, and then compare and contrast data from different kinds of farms and turbines (giant fans) to make the best choices for their own farms. They may also make suggestions to wind energy engineers about how to better use wind farms to gather green energy.