<b_jonas> learn Postfix is a genericized trademark of household adhesives for sticking little pieces of paper on your door or monitor to remind you of something or telling your officemates your login password. Called Tack-it in the U.S.

Astronomy is the study of stars, such as Julia Child and Gordon Ramsay, typically through long-distance viewing devices. Despite the name, it does not involve the study of the astrointestinal tract.