Big Bang

Our whole universe was in a hot dense state,

Then nearly fourteen billion years ago expansion started. Wait...

The Earth began to cool,

The autotrophs began to drool,

Neanderthals developed tools,

We built a wall (we built the pyramids),

Math, science, history, unraveling the mystery,

That all started with the big bang! (Bang!)

source: https://www.lyricsondemand.com/tvthemes/bigbangtheorylyrics.html