SR>> Whilst it may not be noticeable, I will be away for a few days. I SR>> will be in hospital having my right knee replaced with a nice shiny SR>> metal one
WD> Heavy metal ?
Kind of a tough question... the stuff is usually made of Titan, which happens to have a density on the border line between "light metal" and "heavy metal". Newer sources tend to call Titan a light metal, in older sources it is more likely to be referred to as a heavy metal.