Every episode is named after a scientific theory or episode.

Remember when Friends started their episode names with “The One With…”? Well, The Big Bang Theory also had their own trend for their episode titles — mouthful scientific theories or episodes, like “The Positive Negative Reaction,” “The Cooper-Hofstadter Polarization” and “The Vartabedian Conundrum.” The only one that didn’t follow the trend is the first episode, which was titled, “Pilot.”