[voiceover]
Human beings need a lot of things to feel alive.
Family...
Love...
Sex.
But we only need one thing...
To actually be alive.
We need a beating heart.
When our heart is threatened...
We respond in one of two ways.
We either run...
Or...
We attack.
There's a scientific term for this:
Fight...
Or flight.
It's instinct...
We can't control it.
Or can we?
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