蘑菇短视频

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 蘑菇短视频's Alex Ritson challenged her to an impromptu test:

(PHOTO: Blue chrysanthemums. CREDIT: Naonobu Noda/NARO)