A boy wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, walks on a street in the ultra-Orthodox Jewish neighbourhood of Mea Shearim in Jerusalem February 24, 2021. REUTERS/Ammar Awad

Girls wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, walk on a pavement in the ultra-Orthodox Jewish neighbourhood of Mea Shearim in Jerusalem February 24, 2021. REUTERS/Ammar Awad TPX IMAGES OF THE DAY

Boys wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, walk on a pavement in the ultra-Orthodox Jewish neighbourhood of Mea Shearim in Jerusalem February 24, 2021. REUTERS/Ammar Awad

A girl wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, walks on a pavement in the ultra-Orthodox Jewish neighbourhood of Mea Shearim in Jerusalem February 24, 2021. REUTERS/Ammar Awad

Children wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, walk on a pavement in the ultra-Orthodox Jewish neighbourhood of Mea Shearim in Jerusalem February 24, 2021. REUTERS/Ammar Awad

A girl wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, walks to her school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

Boys wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, pose for a picture at their school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

Girls wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, pose for a picture at their school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

Boys wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, pose for a picture at their school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

Parents and their daughter wear dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, as they walk to the girl's school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

Girls wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, pose for a picture at their school in Jerusalem February 24, 2021. REUTERS/Ammar Awad TPX IMAGES OF THE DAY

A boy wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, walks on a sports court at his school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

A girl wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, gestures as she arrives at her school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

A girl wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, arrives at her school in Jerusalem February 24, 2021. REUTERS/Ammar Awad

A teacher and children wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, arrive at their school in Ashkelon, southern Israel February 24, 2021. REUTERS/Amir Cohen

A father accompanies his son who is wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, as they arrive at a school in Ashkelon, southern Israel February 24, 2021. REUTERS/Amir Cohen

Teachers wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, pose for a picture near their school in Ashkelon, southern Israel February 24, 2021. REUTERS/Amir Cohen

Boys wearing dress-up costumes to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, arrive at their school in Ashkelon, southern Israel February 24, 2021. REUTERS/Amir Cohen

A father photographs his daughter who is wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, at a school in Ashkelon, southern Israel February 24, 2021. REUTERS/Amir Cohen

A boy looks through a fence while wearing a dress-up costume to mark the upcoming Jewish holiday of Purim, which is a celebration of the Jews' salvation from genocide in ancient Persia, at a school in Ashkelon, southern Israel February 24, 2021. REUTERS/Amir Cohen

Schoolchildren participate in a lesson at Gustav-Falke elementary school, after it reopened according to first measures to lift the coronavirus disease (COVID-19) lockdown in Berlin, Germany, February 22, 2021. REUTERS/Annegret Hilse

Schoolchildren participate in a lesson at Gustav-Falke elementary school, after it reopened according to first measures to lift the coronavirus disease (COVID-19) lockdown in Berlin, Germany, February 22, 2021. REUTERS/Annegret Hilse

Schoolchildren participate in a lesson at Gustav-Falke elementary school, after it reopened according to first measures to lift the coronavirus disease (COVID-19) lockdown in Berlin, Germany, February 22, 2021. REUTERS/Annegret Hilse

Schoolchildren participate in a lesson at Gustav-Falke elementary school, according to first measures to lift the coronavirus disease (COVID-19) lockdown in Berlin, Germany, February 22, 2021. REUTERS/Annegret Hilse

Schoolchildren participate in a lesson at Gustav-Falke elementary school, according to first measures to lift the coronavirus disease (COVID-19) lockdown in Berlin, Germany, February 22, 2021. REUTERS/Annegret Hilse

Schoolchildren line up outside the Gustav-Falke elementary school as it reopens amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, February 22, 2021. REUTERS/Annegret Hilse

Teacher Claudia Mohme reacts as she waits for the arrival of schoolchildren to pick up their semiannual school certificate through the window of a classroom due to COVID-19 precautions, at the Freiherr-vom-Stein secondary school in Bonn, Germany, January 29, 2021. REUTERS/Wolfgang Rattay

A teacher calls names for schoolchildren to collect a swab and test themselves for COVID-19 to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021. REUTERS/Allison Dinner

Schoolchildren speak in the classroom after swabbing and testing themselves for COVID-19 to prevent the spread of the coronavirus disease (COVID-19) at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021. REUTERS/Allison Dinner

Schoolchildren swab and test themselves for COVID-19 to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021. REUTERS/Allison Dinner

Schoolchildren swab and test themselves for COVID-19 to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021. REUTERS/Allison Dinner

Schoolchildren swab and test themselves for COVID-19 to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021. REUTERS/Allison Dinner

Schoolchildren swab and test themselves for COVID-19 to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021. REUTERS/Allison Dinner

Schoolchildren swab and test themselves for COVID-19 to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021. REUTERS/Allison Dinner TPX IMAGES OF THE DAY

Schoolchildren at Gustav-Falke elementary eat their lunch at the canteen during classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary play soccer during a break in classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary change classrooms during classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary play on the playground during break in classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary play table soccer during a break in classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Drawings on the subject of parents' home office painted by schoolchildren of Gustav-Falke elementary school are displayed in a classroom during classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school run for a break during classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school participate in a lesson with their teacher seen on a screen during classes for children of critical workers amid coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school wash their hands before changing classrooms during classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school keep social distance as they participate in a lesson during classes for children of critical workers amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school participate in a lesson during classes for children of critical workers amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school follow their lessons on laptops during classess for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school participate in a lesson during classes for children of critical workers amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Schoolchildren of Gustav-Falke elementary school keep social distance as they follow their lessons on laptops during classes for children of critical workers, amid the coronavirus disease (COVID-19) lockdown in Berlin, Germany, January 28, 2021. REUTERS/Fabrizio Bensch

Banner reads, "The school is open!!", at the entrance of a primary school as schoolchildren return to the classroom as part of Italy's COVID-19 regulations after the Christmas holidays, while older pupils continue their studies online, in Maleo, one of Lombardy's original 'red zone' towns January 7, 2021. Schoolteacher Toniolo has been documenting what life has been like for a small cluster of northern Italian towns since they were put on lockdown weeks before the rest of the country in February last year. REUTERS/Marzio Toniolo

Primary schoolchildren return to the classroom as part of Italy's coronavirus disease (COVID-19) regulations after the Christmas holidays, while older pupils continue their studies online, in Maleo, one of Lombardy's original 'red zone' towns January 7, 2021. Schoolteacher Toniolo has been documenting what life has been like for a small cluster of northern Italian towns since they were put on lockdown weeks before the rest of the country in February last year. REUTERS/Marzio Toniolo

Elementary schoolchildren return to the classroom as part of Italy's coronavirus disease (COVID-19) regulations after the Christmas holidays, while older pupils continue their studies online, in Maleo, one of Lombardy's original 'red zone' towns January 7, 2021. Schoolteacher Toniolo has been documenting what life has been like for a small cluster of northern Italian towns since they were put on lockdown weeks before the rest of the country in February last year. REUTERS/Marzio Toniolo

Primary schoolchildren enter a classroom as they return to school as part of Italy's coronavirus disease (COVID-19) regulations after the Christmas holidays, while older pupils continue their studies online, in Maleo, one of Lombardy's original 'red zone' towns January 7, 2021. Schoolteacher Toniolo has been documenting what life has been like for a small cluster of northern Italian towns since they were put on lockdown weeks before the rest of the country in February last year. REUTERS/Marzio Toniolo

Primary schoolchildren stand in groups in a school courtyard as they return to the classroom as part of Italy's coronavirus disease (COVID-19) regulations after the Christmas holidays, while older pupils continue their studies online, in Maleo, one of Lombardy's original 'red zone' towns January 7, 2021. Schoolteacher Toniolo has been documenting what life has been like for a small cluster of northern Italian towns since they were put on lockdown weeks before the rest of the country in February last year. REUTERS/Marzio Toniolo

Middle school children converse as they return to the Cesare Piva school, while elder children continue studies online, as part of Italy's the coronavirus disease (COVID-19) regulations after the holidays, in Rome, Italy January 7, 2021. REUTERS/Remo Casilli

A child walks up the stairs as he and other middle school children return to the Cesare Piva school, while elder children continue studies online, as part of Italy's the coronavirus disease (COVID-19) regulations after the holidays, in Rome, Italy January 7, 2021. REUTERS/Remo Casilli

A child gestures after she and other middle school children returned to the classroom at the Cesare Piva school, while elder children continue studies online, as part of Italy's the coronavirus disease (COVID-19) regulations after the holidays, in Rome, Italy January 7, 2021. REUTERS/Remo Casilli

Middle school children return to the Cesare Piva school, while elder children continue studies online, as part of Italy's the coronavirus disease (COVID-19) regulations after the holidays, in Rome, Italy January 7, 2021. REUTERS/Remo Casilli

Middle school children listen to the teacher after returning to the classroom at the Cesare Piva school, while elder children continue studies online, as part of Italy's the coronavirus disease (COVID-19) regulations after the holidays, in Rome, Italy January 7, 2021. REUTERS/Remo Casilli

Middle school children return to the Cesare Piva school, while elder children continue studies online, as part of Italy's the coronavirus disease (COVID-19) regulations after the holidays, in Rome, Italy January 7, 2021. REUTERS/Remo Casilli

Middle school children return to the Cesare Piva school, while elder children continue studies online, as part of Italy's the coronavirus disease (COVID-19) regulations after the holidays, in Rome, Italy January 7, 2021. REUTERS/Remo Casilli