Finnish Prime Minister Sanna Marin faced a quieter day than usual on Wednesday after handing power to a 16-year-old as part of a campaign to promote girls’ rights.Aava Murto, from Vaasky in southern Finland, said she was having an “exciting day” as she faced media on the steps of parliament after meeting with the chancellor of justice.Murto added that she had “learned some new things about legislation”.In the afternoon, the student who actively campaigns on climate and human rights issues was…