The latest teen-girl fiction series to become a movie franchise, Divergent delivers adolescent viewers some bad news and some good news. The bad is that the dystopian future will be just like high school, with kids divided into rigid cliques. The good is that adulthood will be just like high school, so teens face no major surprises.
The human eye can distinguish more than 2 million distinct colors. But scientists studying smell now say they have their vision colleagues beat: The human nose, they say, can distinguish more than a trillion different smells.
Yes, trillion with a T.
That new figure displaces a much more modest estimate. Until now, smell researchers have been saying the human nose can distinguish about 10,000 smells.