Electrolytically refined pure (99.989 %) superficially oxidized lead nodules and a high purity (99.989 %) 1 cm3 lead cube for comparison.

Lead: Our Four-Thousand Year Old Pollutant

The history of lead pollution goes back 4000 years.
Viking ships at sail

L’Anse aux Meadows and the Viking Discovery of North America

Vikings traveled to the New World centuries before Columbus, setting up the establishment that is L'Anse aux Meadows.