TV Episode | TV-PG | | Comedy, Romance
Sheldon kicks Amy out to work solo, so she and Leonard bond during a series of science experiments; Howard is replaced by Bert in Footprints on the Moon; Penny proves to be a surprising source of scientific inspiration for Sheldon. Howard and Raj start a band.
The Far Side comic panel that Sheldon and Amy refer to is a real one that features a child pushing a door that has a large sign that says "Pull." There is a sign in front of the building that says "Midvale School for the Gifted."
Hey, you want to hear one of my geology songs?
Raj Koothrappali: So it's about rocks?
Bert Kibbler: Better. It's about a boulder.
Raj Koothrappali: Isn't that the same thing?
Bert Kibbler: Far from it. A boulder has a diameter greater than 25.6 centimeters.
Raj Koothrappali: Is that fact in the song?
Bert Kibbler: No. Yes. It's sung from the ...
Sheldon says the shape of a slice from a circular pizza is a triangle when in fact it is a sector.