Our monkey brains didn’t evolve to understand big numbers without some help. So when you run into an abstract figure, it’s good to have some real-world thing to compare it to. That’s why I memorise a few stats about the U.S. population; that’s why we made a video comparing Jeff Bezos’s money to Beyoncé’s. When you need to visualise a certain number, large or small, search it on Wolfram Alpha, and you’ll get a comparison to some real-world objects.
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After thousands of years of trying, mathematicians are still working out the number known as pi or “π”. We typically think of pi as approximately 3.14 but the most successful attempt to calculate it more precisely worked out its value to over 13 trillion digits after the decimal point. We have known since the 18th century that we will never be able to calculate all the digits of pi because it is an irrational number, one that continues forever without any repeating pattern. But there is a semblance of order to all that "random" chaos.
Self-tracking can be beneficial if you use it the right way. However, if you're spending too much time focusing on all the numbers in your life and not living it, you're probably going to stress yourself.