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- Around 3,000 people live in the Welsh town of Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch
- Welsh mathematician Robert Recorde (c. 1512-1558) invented the equal sign (=), and introduced the plus (+) and minus (-) signs as well as algebra to Britain.
- The airspeed velocity of an unladen swallow is approximately 11 metres per second
- Barbarossa means red beard