Biology. Everything is a fish or nothing is a fish. Trees don't exist. Tomatoes are fruits as are cucumbers, pumpkins, bell peppers, and most things we don't consider fruits. But all fruits are also vegetables. Strawberries are neither straw nor berries. Etc.
When they said the two hardest things in computer science was naming things and cache invalidation, it's partly because naming things is a hard problem in every discipline.
Biology. Everything is a fish or nothing is a fish. Trees don't exist. Tomatoes are fruits as are cucumbers, pumpkins, bell peppers, and most things we don't consider fruits. But all fruits are also vegetables. Strawberries are neither straw nor berries. Etc.
When they said the two hardest things in computer science was naming things and cache invalidation, it's partly because naming things is a hard problem in every discipline.