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?
- Grey's Anatomy