A Chesterfield Borough Police telephone operator tests a gasmask with built in earpiece and microphone. The telephone service is considered one of the most important links in the coordination of ARP operations and must remain operational during air raids, 12th April 1939. (Photo by Fox Photos/Hulton Archive/Getty Images)

This picture taken on May 4, 2020 shows gentoo penguins chasing krill during feeding time in their enclosure at the Ocean Park theme park, which is currently closed due to the COVID-19 novel coronavirus, in Hong Kong. Save for an absence of gawping crowds, life for the penguins of Hong Kong's Ocean Park has been much the same during the coronavirus pandemic – but their carers have worked long shifts to keep the monochrome troupe healthy. (Photo by Anthony Wallace/AFP Photo)

A health worker dresses in a protective suit before starting to perform the coronavirus testing in an effort to stop the spread of the coronavirus disease (COVID-19) in the Kibera slum of Nairobi, Kenya, May 26, 2020. (Photo by Baz Ratner/Reuters)

University students wearing Guy Fawkes masks pose for a photoshoot of a graduation ceremony to support anti-government protests at the Hong Kong Polytechnic University, in Hong Kong, China on October 30, 2019. (Photo by Tyrone Siu/Reuters)

American plus-size model and television presenter Ashley Graham is seen outside the today show on October 30, 2019 in New York City. (Photo by Raymond Hall/GC Images)

The Duchess of Cambridge joins Family Action at a Christmas Tree Farm to mark her new patronage, in Great Missenden, Buckinghamshire, UK, on the 4th December 2019. (Photo by James Whatling/The Mega Agency)

Zozibini Tunzi, of South Africa, is crowned Miss Universe by her predecessor, Catriona Gray of the Philippines, at the 2019 Miss Universe pageant at Tyler Perry Studios in Atlanta, Georgia, U.S. December 8, 2019. (Photo by Elijah Nouvelage/Reuters)

The thousands of students gathered at Newcastle Racecourse near Newcastle upon Tyne, United Kingdom on March 3, 2019 for a booze-filled night of mayhem. The last race ended at approximately 8pm then the grandstand became like a night-club. (Photo by Craig Connor/North News and Pictures)