The same applies for lakes and rivers as they flow, the outer banks become eroded and the bendiness of the curves increases. Those of you whoвЂ™ve studied chemistryВ mayВ know that the universe tends towards disorder. This phenomenon actually has a very rational explanation. HereвЂ™s the weird part: the average sinuosity of all the lakes and rivers on planet earth is, you guessed it, pi. For an easy analogy, the curlier your hair is, the more sinuosity it has. Sinuosity is defined as how bendy a line is, measured as a ratio between total length and length from start to end вЂњas the crow fliesвЂќ. Its is a pretty cool phenomenon, although it does take a bit of explaining. Better get countingвЂ¦ДҐ вЂ“В This last fact is our favourite вЂ“ pi is in rivers too. This also means that pi seconds is roughly one вЂњnano-centuryвЂќ (1 billionth of a century), so we can flip this relationship to work out that if you live to 100 years old, youвЂ™ll have lived for roughly pi billion seconds.

Want to convert between seconds and years? An easy rule of thumb is that there are roughly pi*10 million seconds in a year.

Well, sort of practical, probably more strange than practical. ItвЂ™s pretty cool how pi and pie sound the same, right? They actually make a better combination than you might think write 3.14 on a piece of paper and hold it up to a mirrorвЂ¦ Spooky.Д¤ вЂ“В Pi has a lot to say in terms of practical applications too. Maybe throw some pineapple in there? Go crazy. Those of you who watched Star Trek may remember Spock defeating an evil supercomputer by commanding it to calculate the last digit of pi.ДЈ вЂ“ If youвЂ™re celebrating Pi Day today, you might do it by baking a pie. In fact, computing pi is so difficult that itвЂ™s used as a stress test for modern computers. He had planned to make it to 93,000 but went wrong on the 67,891 stвЂ¦ ouch! He did do quite a lot better than Ludolph Van Ceulen though, who spent most of his life calculating pi to 35 digits (although we suppose he was probably at a disadvantage for having lived in the 16 th Century). (This, by the way, is not an excuse to skip any pi related questions in upcoming exams).Дў вЂ“ Pi has been calculated by computer up to 13 trillion decimal places, although the human record for reciting it correctly is held by Chao Lu, who remains undefeated since 2005 as reciting 67,890 digits. Although youвЂ™ve been taught that the circumference of a circle is pi*diameter, and that the area of a circle is pi*r 2, the irritating truth is that because we can never know all of the digits of pi, we can never truly know the circumference or the area of a circle. Pi is also an infinite decimal meaning that those significant figures just keep on coming. We donвЂ™t mean that itвЂ™s behaving inexplicably вЂ“ itвЂ™s an irrational number, meaning that no fraction accurately describes pi (except perhaps pi/1, but thatвЂ™s probably cheating). (Title Photo Credit: Wikipedia)ДЎ вЂ“ Pi is irrational. Take a look at the first few digits of pi (3.1415), turn them into a date and youвЂ™ve got 3/14/15! Even better, you donвЂ™t have to worry if youвЂ™re a little too busy to celebrate Pi Day this year, as the digit following 5 is 9, so if we want to be accurate we can round up to make next yearвЂ™s 3/14/16 an extra special Pi Day too! In celebration of this occasion, weвЂ™re bringing you the top 5 facts about pi to brighten up your revision and make Pi Day 2015 that little bit more special. And this year, Pi Day will be extra special. Pi Day is on its way вЂ“ the one time a year where 14-year-olds will see it as socially acceptable to pretend they like maths, and tasty deserts decorated with numbers and Greek symbols grace classrooms worldwide.

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