Featured series 
Tag: scan
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Nation & World
What’s in a face?
Using scans of the brain, Harvard researchers show that patterns of neural activity change when people look at black and white faces, and male and female faces.
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Nation & World
The first word on nouns and verbs
Since humans learned to speak, they have put their words into two basic categories, nouns and verbs. Nouns denote objects; verbs refer to actions. Dictionaries of specialized words have been added by bankers, lawyers, scientists, and clergy, but this core distinction remains.