...extracted from the URINE of cows.
The Big Bang Theory Season 4, Episode 22
Howard Hughes saved his URINE
in milk bottles.
The Big Bang Theory Season 10, Episode 23
that converts URINE
into drinking water.
The Big Bang Theory Season 5, Episode 15
How much URINE
do these suits hold?
The Big Bang Theory Season 5, Episode 24
He was so busy figuring out
how many parts per million of URINE...
The Big Bang Theory Season 8, Episode 9