Utterly useless facts and information

[Hibrandenburg]

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The level used when levelling a professional full size snooker table is that accurate that placing a banknote under it will send the bubble a couple of degrees out.

I take it you mean another form of angle measurement than degrees, I can't imagine that a single bank note would cause a variation of even 1 degree. That would mean that 90 bank notes would cause the level to stand at a right angle to the measuring surface.