London school

LONDON: Michelle Obama on Monday returned to a London school she had visited as US first lady encouraging students to "practice sisterhood" as she presented a new memoir of her life. Obama is in the British capital to promote her hotly-anticipated book, "Becoming", which has already sold more copies than any other book published in the United States this year. She told some 300 students -- mostly girls aged between 11 and 18 -- at a north London school that her past visit there as first lady in 2009 had inspired her to…