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What are some commonly known facts that are too bizarre for you to believe to be true?

For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some 'organic element' since I couldn't accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.

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  • The speed of advancement from the industrial revolution to present.

    The relatively short time humanity has been around

    The universe is finite but expanding

    The Monty Hall problem

    The absolute scale of devastation created by humanity

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