A duo of mathematicians just solved a 15-year-old problem. They found an answer to how many numbers you need to fill an infinite grid under specific conditions. The answer: a simple 15. 15: That ...

But Gaddafi marked his territory by rebaptising the space “Green Square” after seizing power in 1969. In 2009, six days of festivities were organised to mark the 40th anniversary of Gaddafi ...