Un ‘messengers of peace', of which there will now be 10, are celebrities mainly from the fields of film, music, literature and sport who are charged with promoting U.N. activities and ideals through public appearances and media contacts. Actors George Clooney and Michael Douglas, musicians Daniel Barenboim, Midori Goto and Yo-Yo Ma, authors Paulo Coelho and Elie Wiesel, equestrian Princess Haya Bint Al-Hussein and naturalist Jane Goodall are the other peace messengers named this year. __