Workers prepare carnival floats at the Sambadrome stadium in Rio de Janeiro, February 12, 2010. Rio's top samba schools will face off in the Sambadrome, a 700-meter-long runway lined with bleachers and VIP spectator boxes, with elaborate floats, scantily clad dancers and an army of percussionists. Carnival festivities in Brazil will take place from February 12-16. REUTERS/Bruno Domingos (BRAZIL - Tags: SOCIETY)