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- Lead is a highly malleable, very soft, and ductile metal. It is used in
- alloys such as pewter and in electrical solder. Lead was used in ancient
- Roman plumbing systems, and even as recently as earlier this century,
- although it was phased out due to toxicity. Lead was also used in some
- paints, and used to be used as an anti-knock additive in gasoline. Lead
- is the final decay product of many heavy radioactive elements.