Cambodian iron furnace documents shifts in Earth’s magnetic field; water efficiency in early hominids; factors influencing women as hunters; cave footprints in Spain

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Ancient iron furnace in Cambodia shows danger for Earth’s magnetic field

New evidence shows early hominids developed better water efficiency than apes

New insights on why and when ancient women chose to be hunters 

Ancient footprints in Spain give clues to humanity’s relationship with the caves of Ojo Guareña