We just want to keep her
a little longer for OBSERVATION.
The Big Bang Theory Season 7, Episode 15
...correcting for OBSERVATION bias
and postulate an initial dating age of 15...
The Big Bang Theory Season 4, Episode 1
His OBSERVATION of high-energy positrons
has provided the first evidence...
The Big Bang Theory Season 2, Episode 11
As a scientist, I reach conclusions
based on OBSERVATION and experimentation.
The Big Bang Theory Season 1, Episode 10