1) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

2) The name "Bluetooth" comes from the 10th-century Danish king, Harald Bluetooth, who united Denmark and Norway.

3) The World Wide Web, developed by Tim Berners-Lee in 1989, revolutionized the way information is accessed and shared on the internet.

4) The comedy group Monty Python, known for their surreal and irreverent humor, has had a significant influence on comedy and entertainment.