Roman street artist Laika has painted a mural of a Palestinian amputee child outside a school in the Italian capital for World Children's Day on Thursday.     Laika's new work has appeared in front of an elementary school, showing the amputee child, two black tears, and the words 'Shame on You,' "aimed," the artist says, "at those who are perpetrators or accomplices of genocide." On World Children's Day, Save the Children's figures remain dramatic: over 20,000 children killed in Gaza since