The Expedition Approximation
S8, E6: Sheldon and Raj set up a test to find out whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel underneath the university.

S8, E6: Sheldon and Raj set up a test to find out whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel underneath the university.