With epidemics, people have been standing on the shore, waiting for the gusher to hit the ocean. But to prevent epidemics, you have to look at the various little sources that feed into the river.

If you find diseases before they've really emerged, you can control them early on, before you get a major epidemic.

To him it is an ocean, unfathomable, and without a shore.

Many people on our planet right now despair; they think we've reached a point where we've discovered most of the things. I'm going tell you right now: Please don't despair.

Whenever a river reaches the ocean, it waits to go back..

Seasonal flu is now a pandemic that lasts for years and years because you've got so many people that it's jumping back between northern and southern hemispheres and moving itself around the world. By the time it gets back to where it started, it's changed sufficiently so that people are no longer immune.