An Airedale dog sniffing a small flower, which was warmed to help make the airflow visible.
Photo: Gary Settles/Penn State
At Pennsylvania State University, a professor of engineering has captured something less whimsical but no less ephemeral — a cough — on film.
The image, published online Oct. 9 by The New England Journal of Medicine, was created by schlieren photography, which “takes an invisible phenomenon and turns it into a visible picture,” said the engineering professor, Gary Settles, who is the director of the university’s gas dynamics laboratory.
Story: The Mysterious Cough, Caught on Film
By Denise Grady
Published: NYT, October 27, 2008