
♪ The Earth BEGAN to cool ♪
The Big Bang Theory Season 5, Episode 11

♪ The Earth BEGAN to cool
The Big Bang Theory Season 7, Episode 7

♪ The autotrophs BEGAN to drool,
Neanderthals developed tools ♪
The Big Bang Theory Season 12, Episode 2

♪ The autotrophs BEGAN to drool,
Neanderthals developed tools ♪
The Big Bang Theory Season 12, Episode 23

♪ The autotrophs BEGAN to drool,
Neanderthals developed tools ♪
The Big Bang Theory Season 12, Episode 20