I'll give you a HINT.
The Big Bang Theory Season 7, Episode 6
Uh, helpful HINT--
trim your nails first.
The Big Bang Theory Season 5, Episode 17
Hint. Madame Curie had her husband
to help her.
The Big Bang Theory Season 3, Episode 7
Is "back on track" a HINT
that it has something to do with trains?
The Big Bang Theory Season 10, Episode 11
Hint: He and Darth Vader
are tied for number two.
The Big Bang Theory Season 3, Episode 15