Schoolchildren hold a picture of French history teacher Samuel Paty, one year after he was beheaded outside his school in the Paris suburb of Conflans-Sainte-Honorine, as they pose during a ceremony at the Nice Education offices in Nice, France, October 15, 2021. REUTERS/Eric Gaillard

Schoolchildren unveils a plaque to pay tribute to French history teacher Samuel Paty, one year after he was beheaded outside his school in the Paris suburb of Conflans-Sainte-Honorine, during a ceremony at the Nice Education offices in Nice, France, October 15, 2021. REUTERS/Eric Gaillard

Schoolchildren hold a picture of French history teacher Samuel Paty, one year after he was beheaded outside his school in the Paris suburb of Conflans-Sainte-Honorine, during a ceremony at the Nice Education offices in Nice, France, October 15, 2021. REUTERS/Eric Gaillard

Schoolchildren hold a picture of French history teacher Samuel Paty, one year after he was beheaded outside his school in the Paris suburb of Conflans-Sainte-Honorine, during a ceremony at the Nice Education offices in Nice, France, October 15, 2021. REUTERS/Eric Gaillard

Teachers accompany schoolchildren to an underground floor inside a school after gunfire erupted in Beirut, Lebanon October 14, 2021. REUTERS/Issam Abdallah

A woman holds schoolchildren's hands as they leave a school after gunfire erupted in Beirut, Lebanon October 14, 2021. REUTERS/Mohamed Azakir

A teacher teaches to schoolchildren in a classroom at the Petits Bateaux Montessori primary school in the shipbuilding town of Cherbourg-en-Contentin, France, September 23, 2021. Picture taken September 23, 2021. REUTERS/Stephane Mahe

A teacher and schoolchildren are seen in a classroom at the Petits Bateaux Montessori primary school in the shipbuilding town of Cherbourg-en-Contentin, France, September 23, 2021. Picture taken September 23, 2021. REUTERS/Stephane Mahe

A teacher teaches to schoolchildren in a classroom at the Petits Bateaux Montessori primary school in the shipbuilding town of Cherbourg-en-Contentin, France, September 23, 2021. Picture taken September 23, 2021. REUTERS/Stephane Mahe

A schoolchildren walks with her mother to arrive at a primary school on the first day of the new school year after summer break, in Vertou, France, September 2, 2021. REUTERS/Stephane Mahe

Schoolchildren, wearing protective face masks, gather as they arrive at a primary school on the first day of the new school year after summer break, in Vertou, France, September 2, 2021. REUTERS/Stephane Mahe

A schoolchildren walks with her mother to arrive at a primary school on the first day of the new school year after summer break, in Vertou, France, September 2, 2021. REUTERS/Stephane Mahe

Schoolchildren, wearing protective face masks, gather as they arrive at a primary school on the first day of the new school year after summer break, in Vertou, France, September 2, 2021. REUTERS/Stephane Mahe

Schoolchildren, wearing protective face masks, gather as they arrive at a primary school on the first day of the new school year after summer break, in Vertou, France, September 2, 2021. REUTERS/Stephane Mahe

Schoolchildren, wearing protective face masks, gather as they arrive at a primary school on the first day of the new school year after summer break, in Vertou, France, September 2, 2021. REUTERS/Stephane Mahe

A teacher gives a lecture to 6th grade students about the Olympic Games in the classroom at Shiratori elementary school in Tokyo, Japan, June 30, 2021. Picture taken June 30, 2021. REUTERS/Irene Wang

Jun Tashiro, the principal of Shiratori elementary school shows a chart listed with problems to be solved around taking students to go watch the Olympic Games during an interview with Reuters, at the school in Tokyo, Japan, June 30, 2021. Picture taken June 30, 2021. REUTERS/Irene Wang

Students play during lunch break at the Shiratori elementary school playground in Tokyo, Japan, June 30, 2021. Picture taken June 30, 2021. REUTERS/Irene Wang.

A teacher asks students to raise their hands to answer a question about the Olympic Games during class at Shiratori elementary school in Tokyo, Japan, June 30, 2021. Picture taken June 30, 2021. REUTERS/Irene Wang

Britain's Camilla, Duchess of Cornwall, walks by a mascot inspired by Elmer the Patchwork Elephant during a picnic with schoolchildren at St James's Park in London, Britain June 22, 2021. Heathcliff O'Malley/Pool via REUTERS

Britain's Camilla, Duchess of Cornwall, walks with schoolchildren during the launch of the Story Trail at St James's Park in London, Britain June 22, 2021. Heathcliff O'Malley/Pool via REUTERS

Britain's Camilla, Duchess of Cornwall, walks next to an Elmer the Patchwork Elephant mascot and wooden elephant sculptures as she joins a picnic with schoolchildren at St James's Park in London, Britain June 22, 2021. Heathcliff O'Malley/Pool via REUTERS

Britain's Camilla, Duchess of Cornwall, reads to schoolchildren alongside the elephant sculptures recently installed at St James's Park in London, Britain June 22, 2021. Heathcliff O'Malley/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren taking part in an activity during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Britain's Catherine, Duchess of Cambridge joins schoolchildren taking part in an activity during her visit to the Natural History Museum to learn about its Urban Nature Project, in London, Britain June 22, 2021. Geoff Pugh/Pool via REUTERS

Schoolchildren at Yanan Luyi Cultural Park learn how to be guides at Chinese Communist Party history tourism sites, during a government-organised tour marking the 100th founding anniversary of the Communist Party of China, in Yanan, Shaanxi province, China May 30, 2021. Picture taken May 30, 2021. REUTERS/Ryan Woo

Boxes of COVID-19 self-test kit are seen at Lepeltier primary school in La Trinite near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Coat hangers are seen in a corridor as schoolchildren return to classes at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren, wearing protective face masks, return to classes at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren gather in the playground as they return to classes at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A COVID-19 self-test kit is used by school employee at Lepeltier primary school, amid the coronavirus disease (COVID-19) outbreak in La Trinite, near Nice, France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren, wearing protective face masks, are seen in a classroom at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A teacher, wearing a protecive face mask, teaches to schoolchildren in a classroom at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A teacher, wearing a protecive face mask, teaches to schoolchildren in a classroom at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A schoolboy gives a sample during a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A schoolgirl gives a sample during a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren attend a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A COVID-19 self-test kit is used by school employee at Lepeltier primary school, amid the coronavirus disease (COVID-19) outbreak in La Trinite, near Nice, France, April 26, 2021. REUTERS/Eric Gaillard

A COVID-19 self-test kit is used by school employee at Lepeltier primary school, amid the coronavirus disease (COVID-19) outbreak in La Trinite, near Nice, France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren attend a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren attend a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren attend a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A schoolboy gives a sample during a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

A schoolgirl gives a sample during a COVID-19 saliva test at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren, wearing protective face masks, wait for COVID-19 saliva tests at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren wait for COVID-19 saliva tests at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

French schoolchildren gather in the playground as they return to classes at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

French schoolchildren gather in the playground as they return to classes at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

French schoolchildren gather in the playground as they return to classes at Lepeltier primary school in La Trinite, near Nice, amid the coronavirus disease (COVID-19) outbreak in France, April 26, 2021. REUTERS/Eric Gaillard

Schoolchildren walk past an Afghan National Army soldier keeping watch at a checkpoint on the outskirts of Kabul, Afghanistan April 21, 2021. REUTERS/Mohammad Ismail

A man rides past schoolchildren in Shekou area of Shenzhen, Guangdong province, China April 20, 2021. REUTERS/David Kirton

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