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Scientists have created the world's first "true blue" chrysanthemums - experts say many other flowers you probably think are blue actually aren't. Dr Helen Czerski is an expert on colours in nature - the ÃÛÑ¿´«Ã½'s Alex Ritson challenged her to an impromptu test: (PHOTO: Blue chrysanthemums. CREDIT: Naonobu Noda/NARO)