A sharp knife cuts, cuts smoothly, cuts accurately, and requires little effort. A dull knife requires extra effort, requires a hard grip which makes it inaccurate, and wedges (i.e., tears) and crushes instead of cutting. A serrated knife doesn't cut smoothly, it saws, leaving a wide and ragged kerf.
You could assert that as "scientific knowledge," if you like. It's certainly empirical, explanatory and predictive. Explanatory and predictive are pretty much what we're looking for.
And fwiw, empirical knowledge is merely objective knowledge gained through experience. It does not mean theoretical knowledge nor does it specifically mean scientific knowledge. Science happens when observations of natural phenomena suggest questions, an hypotheses is put forward to explain them, predictions are made on the basis of the hypothesis, the predictions are tested by experiment, and the hypothesis is rejected, or refined as a result of the experimental data. In science, strong theories like quantum mechanics, general relativity, and evolution are derived from lots of observation and well tested hypotheses.
That doesn't necessarily mean they're right, but they are certainly good science.
Nearly all modern science is empirical. The idea was important a long time ago when classical theory was more important than scientific method (which incluses experiment). Still, it's important to watch out for those who try to impose "theory" over reality rather than the other way around. You see a lot of that in the regular world, and not just from people who anoint religious and political beliefs as science. There's plenty of what I call anti-science going around. You even see some of it here, and some of that in knife posts.
No biggie though. No one is above a certain amount of sloppy thinking. Especially not me. Taking intellectual short-cuts is part of human nature.
Just two cents,
Edited by boar_d_laze - 3/13/10 at 7:36am