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Well ruby is just corundum which is aluminum oxide so whether its ruby or sappire or common alumina the effect is the same. Most commercial "ruby" is really common alumina opaque and tinged pink so...

Only problem is slate is not sedimentary its metamorphic. It starts as shale which is sedimentary and once its metamorphosed all those particales are further packed down and reduced to form the...

All this talk lately about people experimenting with all kinds of stuff to hone their razors.

When I did that shaving brainbuster about the 3 pigs there was the one who picked up a rock in his...