![Ilsa, the head of the institute.
That's clearly Penny.
Ilsa, the head of the institute.
That's clearly Penny.](https://content2.mcqstudy.com/ss/tbbt-11-15-00:07:06.122.jpeg)
Ilsa, the head of the INSTITUTE.
That's clearly Penny.
The Big Bang Theory Season 11, Episode 15
![at the Hubei Institute
for Nuclear Physics
at the Hubei Institute
for Nuclear Physics](https://content2.mcqstudy.com/ss/tbbt-7-6-00:05:10.281.jpeg)
at the Hubei Institute
for Nuclear Physics
The Big Bang Theory Season 7, Episode 6
![...at the Heidelberg Institute in Germany.
...at the Heidelberg Institute in Germany.](https://content2.mcqstudy.com/ss/tbbt-1-11-00:13:06.785.jpeg)
...at the Heidelberg Institute in Germany.
The Big Bang Theory Season 1, Episode 11