In the Spiral of Ulam the prime numbers are not arranged randomly, but occupy diagonal lines that have to do with relatively simple formulas. In 1963, to pass the time during a boring conference, the Polish-American mathematician Stan Ulam began writing down the natural numbers in the shape of a …
Collision between two helicopters in Nepal on Everest, one dead and 3 injured: why landing at 4,200m is difficult
Collision between two AS350 helicopters on Everest, Nepal. At around 4,200 metres, with thin air and without a control tower, the landing leaves very little margin for error for the pilots. The causes have not yet been clarified by the authorities. Today, November 3 2026, two helicopters AS350 yes they …
Karl Bushby’s world walking tour ended after 28 years: over 50 thousand km from Chile to England
Karl Bushby completed his tour of the world on foot after 28 years: starting from Chile in 1998, he traveled over 50,000 km crossing four continents to return to England, to Hull. The stages and obstacles of the Goliath Expedition. Yesterday Karl Bushby57, returned to England afterwards 28 years away …
