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The BBC found that blue has been a
since research on colour began in the
. Most people's experiences of blue are
. Many colours in nature are blue, especially a blue
, the sea and flowers. A blue sky makes many people very
. The researchers say one of the only
associations with blue was in the English
. In English, people say they "have the
" or are "feeling blue". This means they feel sad. One factor in having a favourite colour is
. Many people like the colour of their favourite sports
.