1) The Brexit process, initiated by the United Kingdom's referendum in 2016, led to the country's withdrawal from the European Union in 2020, marking a significant political and economic change for both the UK and the EU.

2) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

3) The world's first credit card was introduced in 1950 by Diners Club.

4) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.