Although, it is microbiology.
The Big Bang Theory Season 4, Episode 24
Although, now that you've point it out,
it is undeniable.
The Big Bang Theory Season 10, Episode 11
Although we live in a deterministic
universe, each individual has free will.
The Big Bang Theory Season 3, Episode 16
Although sometimes
she omits the veil entirely.
The Big Bang Theory Season 3, Episode 4
SHELDON:
Although, on one occasion...
The Big Bang Theory Season 4, Episode 3