1.   Both male and female subjects succeeded in identifying the smell of fright at a rate better than chance, the researchers found.

2.   Now, a study of mice has found that mammals use multiple sensors to identify different smells.

3.   The belief that a dog identifies the smell of human fear misses the mark by a great distance.

4.   The same sensors are triggered in different combinations to identify different smells.

5.   A friend who came by identified the smell as natural gas.