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The rule of 70 is a useful rule of thumb for quickly calculating the doubling time for something (e.g. population, GDP, internet nodes) that is growing at a

The rule of 70 is a useful rule of thumb for quickly calculating the doubling time for something (e.g. population, GDP, internet nodes) that is growing at a constant rate; it says the doubling time is 70/growth rate. See the video for details and some examples.

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Maybe is not a "problem" but probably a bad allocation of resources who bring to a massive failure of welfare states. It is like a vicious circle: people think than with modern and more expensives treatments the will defeat diseases (and death), so they live in an unhealthy lifestyle (lots of work, stress, bad food, etc.), then doctors and insurance companies raise the bet, tariffs go to sky, politicians offer "good health" to everybody (as if this was possible, the can only offer more expensive treatments), and so a bubble is created up to reach to a whole system broke

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