Hint. Madame Curie had her husband
to help her.
The Big Bang Theory Season 3, Episode 7
Hint: Sometimes they pack the alcohol
in their trunks.
The Big Bang Theory Season 4, Episode 24
with just a HINT of
"That's right, I had servants."
The Big Bang Theory Season 5, Episode 4
With a HINT of ammonia.
The Big Bang Theory Season 5, Episode 7
Hint: it's a cube of a cube
of a prime.
The Big Bang Theory Season 12, Episode 23