It's possible that I don't have enough of it. Yesterday the girls and I were out in the yard, and S was barefoot, as she often is (I am totally in favor of letting kids go barefoot). She comes limping over to me at one point crying about her foot. So I take a look, and see a little thorn, and pull it out. She continues to whine and cry about it for about an hour, and beg for a band-aid. Now S used to be a very tough kid who could shake off most any injury, but lately she has turned very whiney - perhaps it's a five-year-old-thing. Anyway, that's my defense. So I continue to tell her to be brave, that it's no big deal, etc.
Then, I notice that our lawn, which consists mostly of clover, has quite a few bees in it . . . . and I realize that she had stepped on a bee! That explains why the thorn looked so odd - it was really a stinger. Oops!