United Airlines is apologizing to a mother who says a flight crew asked her to remove her son from his breathing machine before they could take off. “The way you treated my son when we were ...

ROME (CNN) — Pope Francis suffered a sudden episode of respiratory difficulty and was put on a breathing machine on Friday, according to the latest medical update from the Vatican.

Limewater can be used to detect carbon dioxide. Breathing in through the mouthpiece draws air from the atmosphere in through tube A. Breathing out through the mouthpiece bubbles exhaled air ...