In the early 1990s there were approximately 5 billion people
In the early 1990s, there were approximately 5 billion people in the world. Plous (1993, p. 5) asked readers to estimate how wide a cube-shaped tank would have to be to hold all of the human blood in the world. The correct answer is about 870 feet, but most people give much higher answers. Explain which of the concepts covered in this chapter leads people to give higher answers.
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