If you being sober go out in jungles or in a dangerous region at dark night with a purpose to get over 500 metres and survive you will make certain that your hearing will greatly sharpen (i.e. the scale of sound perception will change) and it'll seem to you that time passes, goes very slowly (the frequency of your subjective time will change). After such a journey you'll be prepared for adequate estimate of one of mathematical laws - the law of a current moment: h/k=L/(1-k)

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