Quantify

I probably don't need to remind you that your life can change in the blink of an eye. What is that? A tenth of a second, and everything you know does a complete one-eighty. How many people would you say are alive at this moment? I'm going to go with a rediculous number, say, thirty billion.

So if one life changes in the blink of an eye, does that mean that it only takes just over ninety-five years for the entire world to change? That's funny - that number is roughly one lifetime.