Chess descends from chaturanga, a strategy game developed in 7th-century India in which pieces stood for infantry, cavalry, elephants and chariots. It travelled to Persia, where the king became the central piece, and then through the Arab world into Europe. The modern rules took shape in Europe at the end of the 15th century, when the queen and bishop gained far greater power and games became faster. The goal, checkmate, likely comes from the Persian shah mat, meaning the king is helpless. Today millions play, and computers now play far better than any human.

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.