One Answer

    You can't learn:

    • something that contradicts physical laws (for example, running faster than the speed of light)

    • something that contradicts the current level of technology development (for example, transmitting thoughts at a distance without using special devices)

    • something that requires more time than the average human life span (for example, speaking all the languages of the world)

    You can learn everything else if you really want to 🙂

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