Rae, the bar tender, pours a pint dressed for Halloween at Ye Olde Salutation Inn pub amid the coronavirus disease (COVID-19) outbreak, in Nottingham, Britain, October 28, 2020. REUTERS/Molly Darlington

Rae, the bar tender, pours a pint dressed for Halloween at Ye Olde Salutation Inn pub amid the coronavirus disease (COVID-19) outbreak, in Nottingham, Britain, October 28, 2020. REUTERS/Molly Darlington

Two-year-old Bianca Toniolo holds hands with her great-grandfather, Gino Verani, 87, in a rare moment of tenderness, as they watch the news on television during the coronavirus disease (COVID-19) outbreak, at home in San Fiorano, Italy, March 4, 2020. Toniolo said that although both Verani and Bianca loved each other very much, Verani struggled to respect the rules on social distancing which sometimes irritated Bianca, but, it was also just as difficult to make her understand her great-grandfather's difficulties. REUTERS/Marzio Toniolo SEARCH "TONIOLO GRANDFATHER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A water tender truck is seen through charred remains of the historical Cressman's General Store during the Creek Fire in Shaver Lake, California, U.S. September 8, 2020. REUTERS/Stephen Lam

Participants hug each other during a dance break during the Yangon Pride Boat Parade in Yangon, Myanmar, January, 18, 2020. REUTERS/Ann Wang

Hoar-frost covered trees are seen at a lake on a foggy day near Csomor, Hungary, January 17, 2020. REUTERS/Bernadett Szabo

Hoar-frost covered trees are seen at a lake on a foggy day near Csomor, Hungary, January 17, 2020. REUTERS/Bernadett Szabo

A hoar-frost covered tree is seen on a foggy day near Csomor, Hungary, January 17, 2020. REUTERS/Bernadett Szabo TPX IMAGES OF THE DAY

A Jungfraubahnen train carriage makes its way up to Jungfraujoch at the Kleine Scheidegg near Wengen, Switzerland January 16, 2020. REUTERS/Leonhard Foeger

Climbers trek on the Perito Moreno glacier, near the city of El Calafate in the Patagonian province of Santa Cruz, Argentina January 14, 2020. Picture taken January 14, 2020. REUTERS/Agustin Marcarian

A general view of the Perito Moreno glacier, near the city of El Calafate in the Patagonian province of Santa Cruz, Argentina January 14, 2020. Picture taken January 14, 2020. REUTERS/Agustin Marcarian

Tourists look at the Perito Moreno glacier, near the city of El Calafate in the Patagonian province of Santa Cruz, Argentina January 14, 2020. Picture taken January 14, 2020. REUTERS/Agustin Marcarian

A man walks under the Brankov bridge amidst dense fog and smog in Belgrade, Serbia, January 15, 2020. REUTERS/Marko Djurica

A woman walks under the Brankov bridge amidst dense fog and smog in Belgrade, Serbia, January 15, 2020. REUTERS/Marko Djurica

A watchtower is photographed at the fenced area which will be used as heliport during the upcoming World Economic Forum (WEF) in Davos, Switzerland Januar 13, 2020. REUTERS/Arnd Wiegmann

The sun sets over snow-covered field as seen from a train heading to the coal city of Hegang, in Heilongjiang province, northeast China January 1, 2020. Picture taken January 1, 2020. REUTERS/Ryan Woo

A couple embrace before participating in the annual "No Pants Subway Ride" in New York City, U.S., January 12, 2020. REUTERS/Brendan McDermid

Soldiers patrol the Mormon community in La Mora, Sonora, Mexico January 10, 2020. Picture taken on January 10, 2020. REUTERS/Carlos Jasso

Moonset is seen near La Mora, Sonora, Mexico January 11, 2020. Picture taken on January 11, 2020. REUTERS/Carlos Jasso

The full moon rises behind a street light during the penumbral lunar eclipse in Yevpatoriya, Crimea January 10, 2020. Picture taken January 10, 2020. REUTERS/Alexey Pavlishak

The full moon rises behind a street light during the penumbral lunar eclipse in Yevpatoriya, Crimea January 10, 2020. Picture taken January 10, 2020. REUTERS/Alexey Pavlishak

The full moon is seen rising behind a street light during the penumbral lunar eclipse in Ronda, near Malaga, southern Spain January 10, 2020. REUTERS/Jon Nazca TPX IMAGES OF THE DAY

The full moon is seen rising behind an electric tower during the penumbral lunar eclipse in Ronda, near Malaga, southern Spain January 10, 2020. REUTERS/Jon Nazca

The full moon is seen rising behind a tree during the penumbral lunar eclipse in Ronda, near Malaga, southern Spain January 10, 2020. REUTERS/Jon Nazca

Moon is seen behind the mountain seen from the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

Mountains are seen from the Presena Glacier, in Passo Paradiso, Italy, January 9, 2020. Picture taken January 9, 2020. REUTERS/Yara Nardi

A general view shows deep cracks on the bottom of Studena dam near Pernik, Bulgaria, December 8, 2020. Picture taken December 8, 2020. REUTERS/Dimitar Kyosemarliev

A general view shows Studena dam near Pernik, Bulgaria, December 8, 2020. Picture taken December 8, 2020. REUTERS/Dimitar Kyosemarliev

People gather at a deck on the banks of Guaiba River, as a dark horizon caused by smoke from Australia's bush fires is seen, in Porto Alegre, Brazil January 8, 2020. REUTERS/Diego Vara

A murmuration of migrating starlings fly in a group near Kiryat Gat, southern Israel January 2, 2020. Picture taken January 2, 2020. REUTERS/Amir Cohen

Swans swim in a partly frozen lake during sunrise in Minsk, Belarus January 3, 2020. REUTERS/Vasily Fedosenko

Swans paddle on Loch Faskally, Pitlochry, Scotland, Britain October 26, 2019. REUTERS/Russell Cheyne

Los Angeles County fire tender is seen during wind-driven wildfire fire in Sylmar, California, U.S., October 10, 2019. REUTERS/ Gene Blevins

A heart-shaped Chinese flag installation ahead of the 70th founding anniversary of People's Republic of China is seen on a street in Shanghai, China, September 26, 2019. Picture taken with a slow shutter speed and a zoom effect. REUTERS/Aly Song

A heart-shaped Chinese flag installation ahead of the 70th founding anniversary of People's Republic of China is seen on a street in Shanghai, China September 26, 2019. Picture taken with a slow shutter speed and a zoom effect. REUTERS/Aly Song

A heart-shaped Chinese flag installation ahead of the 70th founding anniversary of People's Republic of China is seen on a street in Shanghai, China, September 26, 2019. Picture taken with a slow shutter speed and a zoom effect. REUTERS/Aly Song

Two green sea turtles touch heads at the Israeli Sea Turtle Rescue Center, in Mikhmoret north of Tel Aviv, Israel September 23, 2019. Picture taken September 23, 2019. REUTERS/Amir Cohen

Newly-hatched baby sea turtles make their way into the Mediterranean Sea for the first time, as part of the Israeli Sea Turtle Rescue Center's conservation programme, at a beach near Mikhmoret north of Tel Aviv, Israel September 9, 2019. Picture taken September 9, 2019. REUTERS/Amir Cohen

A newly-hatched baby sea turtle makes its way into the Mediterranean Sea for the first time, as part of the Israeli Sea Turtle Rescue Center's conservation programme, at a beach near Mikhmoret north of Tel Aviv, Israel September 9, 2019. Picture taken September 9, 2019. REUTERS/Amir Cohen

A newly-hatched baby sea turtle makes its way into the Mediterranean Sea for the first time, as part of the Israeli Sea Turtle Rescue Center's conservation programme, at a beach near Mikhmoret north of Tel Aviv, Israel September 9, 2019. Picture taken September 9, 2019. REUTERS/Amir Cohen

A woman paddles on a stand-up board during sunrise in a beach in Larnaca, Cyprus September 15, 2019. REUTERS/Yiannis Kourtoglou

People paddle on a stand-up board during sunrise in a beach in Larnaca, Cyprus September 15, 2019. REUTERS/Yiannis Kourtoglou

People paddle on a stand-up board during sunrise in a beach in Larnaca, Cyprus September 15, 2019. REUTERS/Yiannis Kourtoglou

Britain's Prime Minister Boris Johnson speaks to apprentices accompanied by Britain's Defence Secretary Ben Wallace as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in an activity with school children as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to apprentices as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to apprentices as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to apprentices as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to apprentices as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to apprentices as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS

Britain's Prime Minister Boris Johnson speaks to apprentices as he visits the NLV Pharos, a lighthouse tender moored on the river Thames to mark London International Shipping Week in London, Britain September 12, 2019. Daniel Leal-Olivas/Pool via REUTERS