All horses are the same colour is a paradox that appears to prove something obviously false using a tidy piece of logic. The argument uses mathematical induction, a method that shows a statement holds for every number by checking a base case and a step from one case to the next. Here the step quietly breaks down in the one case where the two overlapping groups of horses do not share any member, so the chain of reasoning fails. The puzzle was first raised by George Polya in 1954 in a version about girls' eye colour, and it was later restated with horses and cows. A 1961 satirical article by Joel E. Cohen used the same structure to prove that Alexander the Great did not exist.

Israeli reports also say the cabinet directed the military to prepare for a possible new attack on Iran.

Angkor, near Siem Reap in northern Cambodia, was the capital of the Khmer Empire, which ruled much of mainland Southeast Asia between roughly the 9th and 15th centuries. At its height the city spread across about 3,000 square kilometres, making it the largest pre-industrial city on Earth by area. Its growth depended on water: huge reservoirs called barays, along with canals and embankments, stored monsoon rain and carried it to rice fields. That system let farmers harvest more than once a year and fed a very large population through the dry season. The temple complex of Angkor Wat, built in the early 12th century, is the best-known monument and still stands at the heart of the park.