premise: Rowing is a traditional sport that has been practiced competitively since the 18th century. Rowers sit in a narrow boat, facing backwards, and use oars or sculls to move the boat forward.
  There are two basic types of competitions: regatta and head-of- the-river races. The regatta is decided by knockout, with a final being held to determine the winning crew.
  Head-of-the-river races are decided by the crew that achieves the fastest time over a set course.
   How is the winning crew in the race decided?
hypothesis: use oars or sculls