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About 70 000 years ago, something happened to the human brain. Humans started to develop "Cognitive Intelligence":
Using words, was a big step in the development of human intelligence: "Elephant" is more informative than "Big Animal". Understanding numbers, was also a big step: "5" or "50" is more informative than "few" or "many".
"There is a lion behind the big oak" is more informative than shouting "Danger!". Having a language is probably a key characteristic that distinguishes us from animals.
Abstract thinking is thinking about things that are not concrete, like freedom, or ideas, or concepts.
Many everyday behaviors use abstract thinking: