The number of major U.S. aerospace and defense prime contractors declined from 51 in the 1990s to five.
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More in History
- Rule 22, the Senate's cloture rule, was adopted in 1917.
- Archaeological studies date human colonization of North America by the Clovis culture to more than 13,000 years ago.
- Chief Justice John Roberts wrote that a former president has absolute immunity for actions within his 'conclusive and preclusive constitutional authority,' at least presumptive immunity for all official acts, and no immunity for unofficial acts.
- Göbekli Tepe covers about 22 acres (roughly 9 hectares) and contains at least seven stone circles.
- Durrington Walls, overlooking the River Avon near Amesbury, is the largest known Neolithic henge in the United Kingdom.
- In 1998, archaeologists discovered the buried skeleton of a four-year-old child dating to approximately 25,000 years ago at Lagar Velho near Leiria, Portugal.