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

2) Male seahorses are the ones who give birth to their offspring.

3) The first modern health insurance policy was introduced in Germany in the late 19th century.

4) The ongoing Rohingya crisis in Myanmar has led to the displacement and persecution of the Rohingya people, drawing international attention and efforts to address the human rights violations and provide support to those affected.