On loan from the Kenyan government since 2011, this stone, known as the Kanjera tool after the site where it lay buried, is the oldest human-made object in any Smithsonian collection. The stone ...

Heavy metals and metalloids are elements that originate from either natural or human-made sources. They're called "heavy" because they're physically dense and their weight is high at an atomic scale.

Early Human Settlement Excavations at the cave site of Latnija by the scientific consortium led by Professor Eleanor Scerri of the Max Planck Institute of Geoanthropology (MPI-GEA) and the University ...