A woman wears a mask with printed lips, amid the spread of the new coronavirus in Caracas, Venezuela, Thursday, April 30, 2020. (Photo by Ariana Cubillos/AP Photo)

Agriculture Secretary Sonny Perdue adjusts his mask before an event in the Roosevelt Room of the White House, Tuesday, May 19, 2020, in Washington. (Photo by Evan Vucci/AP Photo)

A cafe-restaurant staff stands outside as people drink coffee in Monastiraki district of Athens, on Monday, May 25, 2020. Greece restarted regular ferry services to its islands Monday, and cafes and restaurants were also back open for business as the country accelerated efforts to salvage its tourism season. (Photo by Petros Giannakouris/AP Photo)

A Filipino teacher checks a picture of a student shown on a tablet that is attached to robot during a graduation ceremony at a school in Taguig City, Philippines, 22 May 2020. At least 179 high school students received their diploma during an online graduation ceremony that was beamed live on Facebook as a measure to prevent the spread of the coronavirus and COVID-19 disease. (Photo by Francis R. Malasig/EPA/EFE)

A woman raises her fist during events to mark Juneteenth, which commemorates the end of slavery in Texas, two years after the 1863 Emancipation Proclamation freed slaves elsewhere in the United States, amid nationwide protests against racial inequality, in the Harlem neighbourhood of Manhattan, in New York City, New York, June 19, 2020. (Photo by Andrew Kelly/Reuters)

Sikh Nihang's Singh (Sikh warriors) walk along the empty Heritage Street after strict lockdown norms for weekends and public holidays were imposed as a preventive measure against the COVID-19 coronavirus, in Amritsar on June 13, 2020. (Photo by Narinder Nanu/AFP Photo)

Men make sweets at a small traditional factory in preparation for Eid al-Fitr, marking the end of the fasting month of Ramadan amid the spread of the coronavirus disease (COVID-19), in Kabul, Afghanistan on May 21, 2020. (Photo by Mohammad Ismail/Reuters)

Noah, 10, cools himself off in his garden during hot weather in Hertford, Britain, June 25, 2020. The UK is experiencing a summer heatwave, with temperatures in many parts of the country expected to rise above 30°C and weather warnings in place for thunderstorms at the end of the week. (Photo by Andrew Couldridge/Reuters)