When summer heat comes to the Arara neighborhood in northern Rio, it lingers, baking the red brick and concrete that make up many of the buildings long after the sun has gone down. Luis Cassiano, who's lived here more than 30 years, says he's getting worried as heat waves become more frequent and fierce. In poor areas such as Arara, those who can afford air conditioning — Cassiano is one — can't always count on it because of frequent power outages on an overloaded system.

The coming of lab-developed jewels has ignited an unrest in the gemstone business, introducing another outskirts that matches the

Egypt has moved to calm tourists nerves over scaled-back opening hours of shops and restaurants due to the war in Iran, after the country announced it would enforce an earlier closing time due to the oil crisis. Egypt's large-scale energy-saving measures are not intended to apply to popular travel destinations such as Hurghada, Marsa Alam, Luxor, Aswan and Sharm El Sheikh, the tourism ministry said as the rules took effect at the end of March.