What did sociologist duncan watts do to investigate how some pop songs become hits?

A.

Explanation:

Duncan James Watts is a sociologist that was born on February 20, 1971 in Guelph, Canada and became principal researcher at Microsoft Research. To investigate how some pop songs become hits, Watts manipulated songs' ratings and download numbers to observe the effects on songs' popularity. By doing so he analyzed if the manipulated ratings caused the songs popularity to go up or down.

the earthquake in haiti was a magnitude of 7.0 according to the u.s geological survey yet the smaller earthquake in haiti killed more than 200,000 and left more than 1.2 million people homeless. the chile earthquake was a magnitude of 8.8 and 500 times more stronger but chile's earthquake only injured 712 people.