I teach for a living, so it may surprise you that I write these words: Not all knowledge is good. There are some things that are better not to know. Take scientist Ron Fouchier, who developed a strain of the bird flu that could kill 60 percent of the humans it infected. His research was set to be published before the US government stepped in. Do we really want to give terrorists the recipe for killing us? Fouchier said he simply wanted to see what was possible.