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Using the number Pi, we can calculate any circle in the world. This number is the ratio of the circumference of a circle to its diameter. And the diameter is the same in every circle. We have the Egyptians to thank for the discovery of the number Pi. Around 4,000 years ago, they calculated the first circles in order to build storage facilities for their grain. From then on, impressive buildings, temple columns, curves of bridges, and domes could be planned and built. Pi is not only useful, but also a cult number for science. Pi is an irrational number. It has an infinite number of decimal places. It is precisely this infinity that makes Pi so fascinating to scientists. They use supercomputers to try to calculate as many decimal places as possible of the infinite number Pi. The current record is 62.8 trillion decimal places of Pi. A technical challenge with no great everyday use, but with a lot of cult. And it is celebrated worldwide as Pi Day on the 14th day of March, the third month. With a round cake and a run around the circle. A pure gag - the real meaning of pi is already big enough: no circle and no sphere could be calculated without pi. 0:00 What is pi? 1:13 Who discovered the number pi? 2:17 What makes pi so fascinating? Credits: Unsplash.com, University of Applied Sciences Graubünden This video is a ZDF production, in collaboration with Bilderfest. Further links: Subscribe? Just click here - / @terraxplus Terra X plus school in the ZDFmediathek - https://kurz.zdf.de/schuletx/#xtor=CS... Terra X on Facebook - / zdfterrax Terra X on Instagram - / terrax