All the Professors in Pokemon have been named after trees. If you’ve played or watched Pokemon, you’d notice that through all generations, the Professors are named after trees: Professor Oak of Gen I, Professor Elm of Gen II, Professor Birch of Gen III, all up to Professor Sycamore of Gen IX.
100 Mind-Blowing Birch Facts
The oldest piece of chewing gum is more than 9,000 years old. The oldest chewing gum ever found was a lump of birch bark tar that dates back to the Stone Age.