Asterion, the starry Minotaur, Jorges L. Borges, the Labyrint and other.

…and the queen gave birth to a son who was named Asterion… Apollodorus Phalaris’s Brazen Bull Story goes that Phalaris, tyrant of Akragas, a Greek city on the southern cost of Sicily, in today’s territory of Agrigentum, commanded Perillos to invent and design a new torture  device for executing criminals. According to Diodorus Siculus, recounting the story in Bibliotheca Historica, Perillos of Athens proposed  to Phalaris a bull that was made entirely of bronze, hollow,[…]

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The paradox of gravity not respecting the energy conservation principle

Bernoulli’s theorem A body orbiting around a planet is in equilibrium between two forces: the centrifugal force and the gravitational force where Fc is the centrifugal force, Fg is the gravitational force, m1 is the mass of the orbiting body, m2 is the mass of the planet, v is the speed of the body while orbiting, r is the distance of the body from the center of the planet, G is the gravitational constant

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111, 333, 666, and many other curious digits. What are Demlo numbers?

The Earth map used in the UN flag: 33 sectors A grid, probably representing parallels and meridians, divides the Earth in 33 sectors. Another special number is 11, 33 being a multiple of it. You probably wonder what  it means and what relation have these numbers with the Earth. 33 appears immediately as a particular number, being a palindrome. Moreover 3×3=9;  33×3=99… another palindromic digit I like is the number 12321. If you sum all digits, you’ll obtain[…]

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How to model your Earth with Google Sketchup

Sketchup is a 3D CAD software by Google. Many people do not consider it as a professional CAD but it has some good characteristics: –It is free: you can easily download it from sketchup.com; –It is simple to use and it enjoys of an excellent support on Internet with many tutorial videos; –It doesn’t require a workstation but you can reach satisfactory results even without having dedicated graphic board installed on your PC. When focusing the[…]

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