Y'all just need to know what this is. I think this may be the first time I've ever linked to a wikipedia page, but that kind of general overview is good enough for a minimum level of awareness. You folks at least need to know what it is! There is likely to be some kind of short essay question related to this topic on the reading quiz: be sure you know what this is, and then, say, some of its good and bad characteristics. Hint: saving a billion lives is a good thing!