I've seen a visible trail of mist or vapor or something forming while sitting near the wing of a commercial aircraft. It appeared that the speed and or temperature of the metal wing interacted with moisture in the atmosphere to create a trail of "smoke" behind the wing. I've been on about 40...
make someone understand the difference between theoretical physics (which is based on evidence) and junk New Age pseudo-physics.
For example, when the theory of gravity is distorted into the "Law of Attraction" behind THE SECRET which says you can get whatever you want just by thinking about...
That makes sense, and explains how "psychics" can sometimes make correct guesses about a person's personality while being unable to put gambling venues, financial advisers, and police detectives out of business.