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The thousands of aromas humans can smell can be sorted into 10 basic categories, US scientists say.
Prof Jason Castro, of Bates College, and Prof Chakra Chennubhotla, of the University of Pittsburgh, used a computerised technique to whittle down smells to their most basic essence.
They told the PLoS One journal they had then tested 144 of these and found they could be grouped into 10 categories.
The findings are contentious - some say there are thousands of permutations.
http://www.bbc.co.uk/news/health-24123676
Prof Jason Castro, of Bates College, and Prof Chakra Chennubhotla, of the University of Pittsburgh, used a computerised technique to whittle down smells to their most basic essence.
They told the PLoS One journal they had then tested 144 of these and found they could be grouped into 10 categories.
The findings are contentious - some say there are thousands of permutations.
http://www.bbc.co.uk/news/health-24123676