published on: 2016-07-27 03:18:15
oldworldinventions: 1890: “This is the first known photograph
did-you-kno: Barack Obama is the first sitting US president
museum-of-artifacts: Greek coin from Eretria, c. 500-465 BC
historical-nonfiction: The Steppe Geoglyphs of Kazakhstan
did-you-kno: The building blocks of life might be hanging out
Mexico finds water tunnels under Pakal tomb in Palenque