HAVANA () -Cuba is fighting a wave of mosquito-borne illnesses including dengue and chikungunya virus that have swept the island in recent ​weeks, affecting nearly one-third of the population and sickening swaths of workers,‌ the country's top epidimiologist said late on Wednesday. Dengue fever has long plagued Cuba but has grown worse ‌as an economic crisis hampers the government's ability to fumigate, clean roadside trash and patch leaky pipes.

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By Will Dunham WASHINGTON (Reuters) -Scientists have detected some of the oldest signs of life on Earth using a new method that recognizes chemical fingerprints of living organisms in ancient rocks,