1) The English alphabet has five vowels: A, E, I, O, and U.

2) 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.

3) The tongue of a blue whale is so big that about 50 people could stand on it.

4) The word "piano" contains three vowels: I, A, and O.