
♪ The Earth BEGAN to cool
The Big Bang Theory Season 7, Episode 1

# The autotrophs BEGAN to drool,
Neanderthals developed tools #
The Big Bang Theory Season 11, Episode 11

# The Earth BEGAN to cool #
The Big Bang Theory Season 11, Episode 17

♪ The autotrophs BEGAN to drool,
Neanderthals developed tools ♪
The Big Bang Theory Season 7, Episode 22