What are some very interesting scientific or natural facts?

4000 year old olive tree in Greece!

This tree started growing around 2000 BC, during the Bronze Age, around the time the last wooly mammoth was hunted, the 7th dynasty of Egypt was over and humans discovered the existence of glass. This tree has seen humans go from the Bronze Age to the Atomic Age. It has witnessed our changing world and lived through many wars. It has seen many kings, politicians, warriors, and prophets go from birth to death, and it still continues to produce olives annually!

Source: Fabulous Lovers or Weird Everything.