
♪ The Earth BEGAN to cool
The Big Bang Theory Season 7, Episode 17

♪ The autotrophs BEGAN to drool,
Neanderthals developed tools ♪
The Big Bang Theory Season 12, Episode 6

♪ The autotrophs BEGAN to drool,
Neanderthals developed tools ♪
The Big Bang Theory Season 7, Episode 16

♪ The Earth BEGAN to cool
The Big Bang Theory Season 12, Episode 10