Life is priceless. But in Africa a long one may cost no more than $10. And after realizing what such little money can do, a group of Southeast Texans recently traveled overseas to bring health to more than a half-million children. Four people from Southeast Texas joined a national relief campaign sponsored by the United Methodist Church and spent 10 days in Africa earlier this month in an effort to distribute insecticide-treated mosquito nets and vaccines to poverty-stricken villages.