1) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

2) The process of photosynthesis, performed by plants, algae, and some bacteria, is responsible for producing the oxygen we breathe.

3) 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.

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