Aluminum oxide in its alpha crystal form is a mineral called corundum. Pure corundum crystals are naturally colourless, but they usually contain impurities that give them colour, and they can be almost any colour. If they're red, these crystals are called rubies; if orange-pink, they're called padparadschas; and in any other case they're called sapphires. Blue sapphires are one notable variety.
(27 October 2009)Roger Ebert wrote an excellent piece about the current US healthcare nonsense. I don't have a lot to say on that particular topic; I'm not sure how much interest it has for my readers, and he's much better positioned to talk about it and be listened to than I am. One thing I'd like to say, though, is that it reminds me how glad I am I'm living in Canada. Another thing is that, okay, Ebert talks about how "socialism" is a dirty word and used as an excuse for turning off one's brain. Any rational argument on US healthcare can be trumped by calling the other party "socialist." Well, in Canada's own health care debates, which are going on right now though on a much smaller scale than the ones in the States, we have a dirty word like that too. It's used as an excuse for abandoning rational thought. If you propose a plan and I disagree with it, all I have to do is accuse you of proposing a (this dirty word) plan, and that's it, I win, no more debate allowed. Just like calling someone "socialist" in the USA; but the dirty word in Canadian health care debates isn't "socialist."
(24 August 2009)When you think I am "stupid," then you lose the ability to convince me of anything. It doesn't matter whether you say it politely or say it at all. It doesn't matter whether you are right. Having that thought makes it impossible for you to communicate with me effectively. Is it worth it?
(1 June 2008)