Modern humans (Homo sapiens) arrived in Australia at least 40,000 years ago.
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- Göbekli Tepe was built by hunter-gatherers, probably living there year-round, who cut, shaped and moved limestone pillars of up to about 10 tons over distances of roughly 100 to 500 meters without wheels or pack animals.
- In 2011, the CIA declassified the US Government's six oldest classified documents, dating from 1917 and 1918.
- The caetra was a circular shield used by Iberian, Celtiberian, Gallaecian, and Lusitanian warriors.
- Mission Control devised a carbon-dioxide removal solution for Apollo 13 using plastic bags, cardboard, and tape to connect the command module's square lithium-hydroxide canisters to the lunar module's round openings.
- The Middle Kingdom of Ancient Egypt occurred during the Middle Bronze Age.
- Philippe la Renotiere von Ferrari built a stamp collection over 40 years that was seized by the French government after his death in 1917.