A handout still image taken from footage of a video call to mark British Science Week released by Buckingham Palace on March 12, 2021 shows Britain's Queen Elizabeth II in Windsor. - The Queen took part in a virtual science showcase with British scientists, educators and schoolchildren to mark British Science Week, a celebration of the role played in UK society by science, technology, engineering and maths (STEM). (Photo by - / BUCKINGHAM PALACE / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / BUCKINGHAM PALACE" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS