1) The document discusses different definitions and perspectives on what constitutes a "unicorn" startup. It contrasts the common definition of a unicorn as a startup valued at $1 billion or more with Tom Stoppard's definition involving something that causes people to say "WTF?!" and changes how people view the world.
2) It provides examples of historical innovations like the automobile and airplane that were initially unbelievable but ultimately changed society. These are considered "real unicorns."
3) The author argues that to be a true unicorn, a startup or innovation must not only seem unbelievable initially but also transform how the world works and change the people who encounter it, having huge economic and social impacts.
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