California based NASA scientist Dr. Rabindra Mehta knows a reverse swinging ball when he sees it.   Here are his comments in The Times (UK) shared with Mark Henderson.  Click on image for full size PDF.

About commentators getting it wrong:  “Commentators often say it’s reversing when it’s actually contrast swing,” Dr Mehta said. “True reverse-swing occurs only when the ball moves in the opposite direction to the seam.”

About weather: “My latest theory is that when bowlers show up and the conditions look ideal, maybe they subconsciously orient their wrists better and bowl a bit fuller,” he said. “Perhaps they just bowl better.”

Click here for full article.   It is really interesting.