

(AngloSaxon lead; L. plumbum) Long known, mentioned in Exodus. The alchemists believedlead to be the oldest metal and associated with the planet Saturn. Native lead occurs innature, but it is rare.
Lead is obtained chiefly from galena (PbS) by a roasting process. Anglesite, cerussite,and minim are other common lead minerals.
'Physics is mathematical not because we know so much about the physical world, but because we know so little; it is only its mathematical properties that we can discover.'
Bertrand Russell
(18721970)