The Big Bang Theory - The Expedition Approximation
Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel. Meanwhile, Leonard and Penny seek advice from Wolowitz and Bernadette after they fight about money.
- Season: 8
- Episode: 6
- Runtime: 30
- Aired: October 20th, 2014 at 20:00