An analogy for obvious. This was originally coined by a pharmacy professor at the UT Health
Science Center at San Antonio. The professor was referring to Phineas
Gage, a 19th century railroad worker, who suffered a freak accident when an explosion catapulted a
large piece of iron through his skull and into his frontal lobes. An injury that was anything but subtle.
Professor: "what's an antibiotic used for?"
Student
Bob: "Uh, there is an inhibitory, Uh, upregulation and, Uh half life ..."
Professor: "An antibiotic kills bacteria.
Bob, the answer was
like a nail in the head and somehow you completely missed it"