A dream is a sequence of images, scenes, emotions and sensations that happens involuntarily during sleep. Most people spend more than two hours a night dreaming, with individual dreams lasting roughly 5 to 20 minutes. Dreams occur mostly in REM sleep, when brain activity is high and resembles waking, but people also dream in non-REM sleep, and not every REM awakening produces a dream report. Scientists can only study dreams through verbal reports, which are memories of the dream rather than the experience itself, so claims that animals dream remain unprovable. Researchers still do not know which brain regions start dreams or what purpose they serve. Ideas range from memory consolidation and emotional processing to threat simulation, and none has been proven.

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.