A zookeeper feeds a hippopotamus with a watermelon in its enclosure in Belgrade's zoo, Serbia, July 20, 2015. Temperatures in Serbia have risen up to 40 degrees Celsius (104 degrees Fahrenheit), according to official meteorological data. (Photo by Marko Djurica/Reuters)

The northeastern United States sweltered this week in a scorching summer heat wave, complete with stagnant, sticky air and no winds for relief, forecasters said. Even in a summer already filled with stretches of very hot weather, this week will be stubbornly brutal, with no relief in sight until the weekend brings thunderstorms to the region, they said. "Plain and simple, this week may feel the worst of any week for this summer in the Northeast," said Accuweather.com meteorologist Alex Sosnowski. (Reuters)

Members of the China Disabled Peoples Performing Art Troupe perform “My Dream” at Jorge Eliecer Gaitan Theater in Bogota on August 30, 2017. China Disabled People's Performing Art Troupe Company composed of artists with some hearing, mental, motor, visual or speech disabilities, was founded in 1987 and is currently Honorary and Goodwill Ambassadors of Unesco for its great example of inclusion. (Photo by John Vizcaino/AFP Photo)

Models present creations of the label Mas Holdings during the Mercedes-Benz Fashion Week at Grandpass in Colombo, Sri Lanka, 28 October 2017. (Photo by M.A. Pushpa Kumara/EPA/EFE)

Elizabeth Hurley (L) and Nicole Scherzinger serve dinner at the BOVET 1822 Brilliant is Beautiful Gala benefitting Artists for Peace and Justice's Global Education Fund for Women and Girls at Claridge's Hotel on December 1, 2017 in London, England. (Photo by Vianney Le Caer/Rex Features/Shutterstock)

Minnie Mouse, left, and Katy Perry attend a ceremony honoring Minnie with a star on the Hollywood Walk of Fame on Monday, January 22, 2018, in Los Angeles. (Photo by Mario Anzuoni/Reuters)

Russia' s Tiffani Zagorski and Russia' s Jonathan Guerreiro compete in the ice dance free dance of the figure skating event during the Pyeongchang 2018 Winter Olympic Games at the Gangneung Ice Arena in Gangneung on February 20, 2018. (Photo by Lucy Nicholson/Reuters)