MIT researchers developed a new ultrasonic device that can harvest clean drinking water from the air in minutes. | CNN

Prof. Walter Lewin, the famous MIT physicist, often demonstrated Bernoulli’s Principle in his engaging lectures. Bernoulli’s Principle states that as the speed of a fluid increases, its pressure decreases. In his demonstrations, Lewin used simple yet striking experiments—such as blowing between suspended objects or directing airflow over a sheet of paper—to show how faster-moving air creates lower pressure, causing objects to move together or lift. His style of teaching made abstract physics con