Why knocking is so important.

[pocaracas]

So the fact drip went on and on about effect of ambient temperature on air density, without once noticing the much more dominating effects of shape and density, shows he has zero native understanding of either the original problem of acceleration of gravity, or the spurious problem of drag he introduced to muddy the water.

When one tries to change the topic or inject unrelated factors to avoid exposing one's ignorance, one should use something one knows well. One should disguise stench with perfume. But drippy seem to not perceive the wisdom in that. He is apparently dumb enough to thinks he would stink less if he threw more shit.

Sadly, some people think they know a lot about a given subject, when they actually know very little.... and even sadder are those who use that little they know and dress it up as if it was a lot. It's a strategy that works on a lot of the population, I'll grant him that. But not here.

Once, my aunt (one of those who thinks they know it all) was saying something bad about microwave ovens... something about them having very small waves which penetrate everything and cause havoc.... then I just said "but, but light waves are much smaller and no one complains." Light wavelengths are in the order of hundreds of nanometers, while microwave ovens use... errr.... micrometer waves, duh, oh... 1 micrometer = 10^-6 m; one nanometer = 10^-9.
And I'm not sure which wavelength kitchen microwave ovens use, but they should be in the single digit GHz range, so, hundreds of micrometers... close to mm. Let me google that for me:

Consumer ovens usually use 2.45 gigahertz (GHz)—a wavelength of 12.2 centimetres (4.80 in)

Darn, I was right on the GHz, but a bit off on the mm...12 cm... well, it did have to be larger than the metallic mesh you see on the oven's door's window.

Ultra-violet and X-rays, on the other hand, are indeed much shorter than visible light waves and do penetrate...

But we were talking about my aunt, she just replied "oh, shut up!" and couldn't finish her horror Microwave tale possibly induced by some gas company wishing to put fear into the consumer's heart, so that they won't pick up on those vile cancer-making machines.