Britain's Prime Minister Boris Johnson speaks with pupils after taking part in a science lesson at King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

Britain's Prime Minister Boris Johnson and Chancellor of the Exchequer Rishi Sunak take part in a science lesson at King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

Britain's Prime Minister Boris Johnson gestures as he takes part in a science lesson during a visit at King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

Britain's Prime Minister Boris Johnson and Chancellor of the Exchequer Rishi Sunak take part in a science lesson at King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

Britain's Prime Minister Boris Johnson bumps elbows with a person during a science lesson at King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

Britain's Prime Minister Boris Johnson takes part in a science lesson during a visit to the King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

Britain's Prime Minister Boris Johnson gestures as he takes part in a science lesson at King Solomon Academy in Marylebone, London, Britain, April 29, 2021. Dan Kitwood/Pool via REUTERS

School students wearing protective face masks take part in a judo lesson operated by Akiko Amano (not in picture), a judoist, the sole Japanese judo judge for the Tokyo 2020 Olympics, and the 15th-generation and first female head of the country?s oldest fireworks company, in Tokyo, Japan April 28, 2021. Picture take April 28, 2021. REUTERS/Issei Kato

School students wearing protective face masks take part in a judo lesson operated by Akiko Amano (not in picture), a judoist, the sole Japanese judo judge for the Tokyo 2020 Olympics, and the 15th-generation and first female head of the country?s oldest fireworks company, in Tokyo, Japan April 28, 2021. Picture take April 28, 2021. REUTERS/Issei Kato

A school student wearing a protective face mask takes part in a judo lesson operated by Akiko Amano (not in picture), a judoist, the sole Japanese judo judge for the Tokyo 2020 Olympics, and the 15th-generation and first female head of the country?s oldest fireworks company, in Tokyo, Japan April 28, 2021. Picture take April 28, 2021. REUTERS/Issei Kato

Akiko Amano, 50, a judoist, the sole Japanese judo judge for the Tokyo 2020 Olympics, and the 15th-generation and first female head of the country?s oldest fireworks company, prepares for a judo lesson for her students at the judo hall of her house in Tokyo, Japan April 28, 2021. Picture take April 28, 2021. REUTERS/Issei Kato

School students wearing protective face masks take part in a judo lesson operated by Akiko Amano (not in picture), a judoist, the sole Japanese judo judge for the Tokyo 2020 Olympics, and the 15th-generation and first female head of the country?s oldest fireworks company, in Tokyo, Japan April 28, 2021. Picture take April 28, 2021. REUTERS/Issei Kato

Neldjibaye Madjissem, 31, unemployed, who graduated with a mathematics diploma in 2015, gives private lessons to survive in N'djamena, Chad April 26, 2021. Picture taken April 26, 2021. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY

Neldjibaye Madjissem, 31, unemployed, who graduated with a mathematics diploma in 2015, gives private lessons to survive in N'djamena, Chad April 26, 2021. Picture taken April 26, 2021. REUTERS/Zohra Bensemra

Neldjibaye Madjissem, 31, unemployed, who graduated with a mathematics diploma in 2015, gives private lessons to survive in N'djamena, Chad April 26, 2021. Picture taken April 26, 2021. REUTERS/Zohra Bensemra

Neldjibaye Madjissem, 31, unemployed, who graduated with a mathematics diploma in 2015, gives private lessons to survive in N'djamena, Chad April 26, 2021. Picture taken April 26, 2021. REUTERS/Zohra Bensemra

Disinfectant is seen on a table as a student solves a problem during a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

A student solves a problem during a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

A student solves a problem during a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

A teacher gives a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

Students attend a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

Students attend a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

Students attend a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

Students attend a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

Students attend a lesson at Liceo Scientific Isacco Newton, as much of the country becomes a 'yellow zone', easing the coronavirus disease (COVID-19) restrictions and allowing students of all ages to go back to school, in Rome, Italy, April 26, 2021. REUTERS/Guglielmo Mangiapane

A teacher gives girls and boys an Arabic alphabet lesson at a Koran recitation class during the holy month of Ramadan at the Grand mosque in Sanaa, Yemen April 21, 2021. Pictures taken April 21, 2021. REUTERS/Khaled Abdullah

A boy recites the Koran as he attends an Arabic alphabet lesson during the holy month of Ramadan at the Grand mosque in Sanaa, Yemen April 21, 2021. Pictures taken April 21, 2021. REUTERS/Khaled Abdullah

Nurse Pauline Falzon prepares an intravenous antibiotics infusion for Rebecca Zammit Lupi, a 14-year-old cancer patient, as Rebecca takes part in an online computer studies lesson in her room at Rainbow Ward in Sir Anthony Mamo Oncology Centre at Mater Dei Hospital, during the coronavirus disease (COVID-19) outbreak, in Tal-Qroqq, Malta, June 1, 2020. Rebecca's pleas for online education for ill children to continue post COVID-19 caught the attention of the national media and the authorities. "Once online school became real, I actually found studying fun! I hadn't studied in months because I never felt up to just reading the notes my friends had given me. I feel that joining some of the lessons, after being out of school for so long, made my teachers, friends and myself very happy!" said Rebecca at the time. REUTERS/Darrin Zammit Lupi SEARCH "REBECCA LUPI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES

A student listens during a math lesson at Kratzer Elementary School in Allentown, Pennsylvania, U.S., April 13, 2021. Picture taken April 13, 2021. REUTERS/Hannah Beier

Carol Kranyecz, an emotional support teacher at Orefield Middle School, runs a lesson from the AIM-Accept, Identify, Move-curriculum in Orefield, Pennsylvania, U.S., April 12, 2021. Through these lessons, students learn psychological skills such as being mindful, acceptance of difficult emotions, identifying their values, and committing to action to move toward their goals. Picture taken April 12, 2021. REUTERS/Hannah Beier

Carol Kranyecz, an emotional support teacher at Orefield Middle School, runs a lesson from the AIM-Accept, Identify, Move-curriculum in Orefield, Pennsylvania, U.S., April 12, 2021. Through these lessons, students learn psychological skills such as being mindful, acceptance of difficult emotions, identifying their values, and committing to action to move toward their goals. Picture taken April 12, 2021. REUTERS/Hannah Beier

Apple Inc. iPads are stored in boxes for charging before being used for online lessons at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

Apple Inc. iPads are stored in boxes for charging before being used for online lessons at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

School director and teacher Antje Luekemann speaks during a lesson at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

School director and teacher Antje Luekemann speaks during a lesson at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

School director and teacher Antje Luekemann speaks during a lesson at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

Teacher Anke Wendt uses an Ipad during a streaming lesson before she distributes COVID-19 antigen tests to schoolchildren of the 10C class at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

Teacher Anke Wendt uses an Ipad during a streaming lesson as she distributes COVID-19 antigen tests to schoolchildren of the 10C class at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

Teacher Anke Wendt uses an Ipad during a streaming lesson as she distributes COVID-19 antigen tests to schoolchildren of the 10C class at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

Teacher Anke Wendt speaks during a lesson before she distributes COVID-19 antigen tests to schoolchildren of the 10C class at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

Teacher Anke Wendt uses an Ipad during a streaming lesson before she distributes COVID-19 antigen tests to schoolchildren of the 10C class at the Gymnasium Steglitz in Berlin, Germany, April 12, 2021. REUTERS/Michele Tantussi

People take a gymnastic lesson on the first day of the reopening of gyms after a countrywide lockdown, amid the coronavirus disease (COVID-19) pandemic, in Lisbon, Portugal, April 5, 2021. REUTERS/Pedro Nunes

Schoolchildren attend a lesson in their classroom at a private school in Saint-Sebastien-sur-Loire, as France will start its third national lockdown and shools will close for three weeks to push back a third wave of the coronavirus disease (COVID-19) infections, France, April 2, 2021. REUTERS/Stephane Mahe

Schoolchildren attend a lesson in their classroom at a private school in Saint-Sebastien-sur-Loire, as France will start its third national lockdown and shools will close for three weeks to push back a third wave of the coronavirus disease (COVID-19) infections, France, April 2, 2021. REUTERS/Stephane Mahe

Schoolchildren, wearing protective face masks, attend a lesson in their classroom at a private school in Saint-Sebastien-sur-Loire, as France will start its third national lockdown and schools will close for three weeks to push back a third wave of the coronavirus disease (COVID-19) infections, France, April 2, 2021. REUTERS/Stephane Mahe

Schoolchildren attend a lesson in their classroom at the private primary school Jeanne D'Arc in Saint-Maur-des-Fosses, near Paris, amid the coronavirus disease (COVID-19) outbreak in France, March 30, 2021. REUTERS/Gonzalo Fuentes

Schoolchildren, wearing protective face masks, attend a lesson in their classroom at the private primary school Jeanne D'Arc in Saint-Maur-des-Fosses, near Paris, amid the coronavirus disease (COVID-19) outbreak in France, March 30, 2021. REUTERS/Gonzalo Fuentes

Schoolchildren attend a lesson in their classroom at the private primary school Jeanne D'Arc in Saint-Maur-des-Fosses, near Paris, amid the coronavirus disease (COVID-19) outbreak in France, March 30, 2021. REUTERS/Gonzalo Fuentes

People take surfing lessons in Arpoador beach as individual sports are allowed, after the city of Rio de Janeiro decreed 10 days of holiday to contain the advance of the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil March 26, 2021. REUTERS/Pilar Olivares

Hearing-impaired Palestinian women attend a lesson as they learn to make animation films in the central Gaza Strip March 18, 2021. Picture taken March 18, 2021. REUTERS/Mohammed Salem

Hearing-impaired Palestinian women attend a lesson as they learn to make animation films in the central Gaza Strip March 18, 2021. Picture taken March 18, 2021. REUTERS/Mohammed Salem

Hearing-impaired Palestinian women attend a lesson as they learn to make animation films in the central Gaza Strip March 18, 2021. Picture taken March 18, 2021. REUTERS/Mohammed Salem

Maria Reyes, a cleaning worker, listens to a teacher from a tablet during her younger son Max's lesson as her other son Alex studies from a book, while Mexico marks one year anniversary of homeschooling after the schools closed due to the coronavirus disease (COVID-19) pandemic in Mexico City, Mexico March 17, 2021. Picture taken March 17, 2021.REUTERS/Carlos Jasso

Maria Reyes, a cleaning worker, reacts while her sons take their lessons inside their home, as Mexico marks one year anniversary of homeschooling after the schools closed due to the coronavirus disease (COVID-19) pandemic in Mexico City, Mexico March 17, 2021. Picture taken March 17, 2021.REUTERS/Carlos Jasso

Maria Reyes, a cleaning worker, cooks while her sons take their lessons inside their home, as Mexico marks one year anniversary of homeschooling after the schools closed due to the coronavirus disease (COVID-19) pandemic in Mexico City, Mexico March 17, 2021. Picture taken March 17, 2021.REUTERS/Carlos Jasso

Maria Reyes, a cleaning worker, gives food to her dog while her sons take their lessons inside their home, as Mexico marks one year anniversary of homeschooling after the schools closed due to the coronavirus disease (COVID-19) pandemic in Mexico City, Mexico March 17, 2021. Picture taken March 17, 2021.REUTERS/Carlos Jasso

Maria Reyes, a cleaning worker, listens to a teacher from a tablet during the class of her younger son Max as her other son Antonio takes a lesson on his tablet, while Mexico marks one year anniversary of homeschooling after the schools closed due to the coronavirus disease (COVID-19) pandemic, in Mexico City, Mexico March 17, 2021. Picture taken March 17, 2021.REUTERS/Carlos Jasso

Max Gallardo, 11, listens to his teacher from a tablet during a lesson as his brother looks at his tablet, as Mexico marks one year anniversary of homeschooling after the schools closed due to the coronavirus disease (COVID-19) pandemic, in Mexico City, Mexico March 17, 2021. Picture taken March 17, 2021.REUTERS/Carlos Jasso

Students attend a lesson at Weaverham High School, as the coronavirus disease (COVID-19) lockdown begins to ease, in Cheshire, Britain, March 9, 2021. REUTERS/Jason Cairnduff

Students attend a lesson at Weaverham High School, as the coronavirus disease (COVID-19) lockdown begins to ease, in Cheshire, Britain, March 9, 2021. REUTERS/Jason Cairnduff