Love it or not, wind is a two-faced force of nature. While we welcome the pleasure of a cool breeze, or even strong gust, we tremble at the thought of gales, tornadoes and hurricanes. What is wind? Hank Green of SciShow answers in one simple sentence. “Wind is caused by air flowing from an area of high pressure to an area of low pressure,” he says. “The closer the high and low pressures are to each other, the stronger the wind.” Tune in as Green gets a bit more technical in this edition of SciShow.