Why are we alive?
And here's how they replied
You're what happens when two substances collide
And by all accounts you really should have died

from Andrew Bird – A Nervous Tic Motion of the Head to the Left Lyrics on Rap Genius

Meaning

Andrew uses the metaphor of the multiplier effect and intertwines it with the miracle of life. While someone could be created from the intercourse resulting from individuals tripping on two drugs, we are also borne of the simplest two substances…a sperm and an egg:

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