He's a 'mechanical' genius. [=he is a person who is very smart about machines]
He's not 'mechanically' inclined. [=he is not knowledgeable about machinery]
The flight was delayed because of 'mechanical' problems/difficulties.
(..) the answer is attoseconds. - That is correct. - I knew that, too. Good for you, sweetie. Okay, next question: "What is the quantum mechanical effect "used to encode data on hard-disk drives?" And of course the answer is giant magnetoresistance. - Right. (..)2008 TvShow: The Big Bang Theory Title: The Bat Jar Conjecture Season: 1 Episode 13