Fireworks light up the sky during the 'Beehive Firecrackers' festival at the Yanshui district in Tainan, Taiwan, February 26, 2021. Picture taken on February 26, 2021. REUTERS/Ann Wang

Fireworks light up the sky while a crowd is not allowed to enter the festival ground due to coronavirus disease (COVID-19) restrictions during the 'Beehive Firecrackers' festival at the Yanshui district in Tainan, Taiwan, February 26, 2021. Picture taken on February 26, 2021. REUTERS/Ann Wang

The moon illuminates sky during an evening with spring-like temperatures at the collonades of the museum island complex, amid the coronavirus disease (COVID-19) pandemic during lockdown, in Berlin, Germany, February 25, 2021. REUTERS/Fabrizio Bensch

The Eiffel Tower lights the sky behind the financial district of La Defense during a nationwide curfew, from 6 p.m to 6 a.m, due to tighter measures against the spread of the coronavirus disease (COVID-19) near Paris, France, February 24, 2021. REUTERS/Christian Hartmann

The Eiffel Tower lights the sky behind the financial district of La Defense during a nationwide curfew, from 6 p.m to 6 a.m, due to tighter measures against the spread of the coronavirus disease (COVID-19) near Paris, France, February 24, 2021. REUTERS/Christian Hartmann

Frozen Lake Silvaplanasee and Lake Silsersee are seen while Sahara dust makes the sky misty at the Corviglia ski area, as the spread of the coronavirus disease (COVID-19) continues, near the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Sahara dust makes the sky misty while skiers slide down a piste at the Corviglia ski area, as the spread of the coronavirus disease (COVID-19) continues, in the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Sahara dust makes the sky misty, as the spread of the coronavirus disease (COVID-19) continues, in the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Sahara dust makes the sky misty while skiers rest beside a piste at the Corviglia ski area, as the spread of the coronavirus disease (COVID-19) continues, in the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Sahara dust makes the sky misty while skiers queue in front of the Audi Ski Run at the Corviglia ski area, as the spread of the coronavirus disease (COVID-19) continues, in the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Sahara dust makes the sky misty as a cablecar is seen above a piste at the Corviglia ski area, as the spread of the coronavirus disease (COVID-19) continues, in the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Sahara dust makes the sky misty as skiers rest on the terrace of a restaurant beside a piste at the Corviglia ski area, as the spread of the coronavirus disease (COVID-19) continues, in the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Sahara dust makes the sky misty as skiers rest on the terrace of a restaurant beside a piste at the Corviglia ski area, as the spread of the coronavirus disease (COVID-19) continues, in the Alpine resort of St. Moritz, Switzerland February 23, 2021. REUTERS/Arnd Wiegmann

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, continues to erupt, as seen from the village of Fornazzo, Italy February 23, 2021. REUTERS/Antonio Parrinello REFILE - CORRECTING ACTION

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, continues to erupt, as seen from the village of Fornazzo, Italy February 23, 2021. REUTERS/Antonio Parrinello REFILE - CORRECTING ACTION

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, continues to erupt, as seen from the village of Fornazzo, Italy February 23, 2021. REUTERS/Antonio Parrinello REFILE - CORRECTING ACTION

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, continues to erupt, as seen from the village of Fornazzo, Italy February 23, 2021. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY REFILE - CORRECTING ACTION

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, continues to erupt, as seen from the village of Fornazzo, Italy February 23, 2021. REUTERS/Antonio Parrinello REFILE - CORRECTING ACTION

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, continues to erupt, as seen from the village of Fornazzo, Italy February 22, 2021. Picture taken February 22, 2021. REUTERS/Antonio Parrinello REFILE - CORRECTING ACTION

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, continues to erupt, as seen from the village of Fornazzo, Italy February 23, 2021. REUTERS/Antonio Parrinello REFILE - CORRECTING ACTION

Sparrows fly as part of a rainbow is seen in the sky, in Ashkelon, southern Israel February 18, 2021. REUTERS/Amir Cohen

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinellö

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, in Catania, Italy, Feburary 15, 2021. REUTERS/Antonio Parrinello

AI-powered robot Lexi stands in the lobby welcoming guests at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

AI-powered robot Ariel delivers room service to a guest at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

A waiter places food inside a box attached to AI-powered robot Ariel for delivery to a guest at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

AI-powered robot Ariel waits for room service food to be placed in its box for delivery to a guest at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

AI-powered robot Ariel delivers room service to a guest at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

AI-powered robot Ariel delivers room service to a guest at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

AI-powered robot Ariel stands outside a lift before delivering room service at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/ Sumaya Hisham

AI-powered robot Ariel waits for a lift before delivering room service at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

AI-powered robot Ariel stands outside a lift before delivering room service at the Hotel Sky, the first in Africa to use automated attendants, in Johannesburg, South Africa, February 9, 2021. Picture taken February 9, 2021. REUTERS/Sumaya Hisham

A lightning strike lights up the sky during a thunder storm at Red Sea resort of Sharm el-Sheikh, south of Cairo, Egypt February 4, 2021. REUTERS/Amr Abdallah Dalsh

A lightning strike lights up the sky during a thunder storm at Red Sea resort of Sharm el-Sheikh, south of Cairo, Egypt February 4, 2021. REUTERS/Amr Abdallah Dalsh

A lightning strike lights up the sky during a thunder storm at Red Sea resort of Sharm el-Sheikh, south of Cairo, Egypt February 4, 2021. REUTERS/Amr Abdallah Dalsh

A lightning strike lights up the sky during a thunder storm at Red Sea resort of Sharm el-Sheikh, south of Cairo, Egypt February 4, 2021. REUTERS/Amr Abdallah Dalsh

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY

Large streams of red hot lava shoot into the night sky as Mount Etna, Europe's most active volcano, leaps into action, seen from the village of Fornazzo, Italy, February 3, 2021. Picture taken February 3, 2021. REUTERS/Antonio Parrinello

Lightning illuminates the sky above the National Congress in Brasilia, Brazil February 3, 2021. REUTERS/Ueslei Marcelino TPX IMAGES OF THE DAY

Lightning illuminates the sky above the Planalto Palace in Brasilia, Brazil February 3, 2021. REUTERS/Ueslei Marcelino