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

2) Insurance fraud occurs when individuals or organizations deliberately deceive insurance companies to receive undeserved benefits.

3) The first recorded car accident occurred in 1891 in Ohio.

4) The construction of the Great Wall of China began in the 7th century BC and was completed over several centuries, spanning thousands of miles.