If you’ve ever had a bumpy airplane ride, you know it’s nothing fun. But have you ever noticed that the pilots sometimes tell you ahead of time to buckle in? How do they know turbulence is ahead? Are they some kind of fortune teller? How can anyone see wind?Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htmAnd to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices
