For example, Americans smile so much that visitors to the U.S. are sometimes taught to smile more often while there, but they are often only taught one type of smile, which can cause confusion in ...

What it means: The forced smile is similar to the Pan Am smile, but the forced smile is less obvious or pronounced. This subtle type of smile doesn't usually include showing teeth, and the lips ...

No less than 16 different types of nerve cells have been identified by scientists in a new study on the human sense of touch. Comparisons between humans, mice and macaques show both similarities ...

Health We now know how many cells there are in the human body. New estimates for the number of cells in adults and children draw on over 1500 scientific papers detailing the different cell and ...