While there has been speculation that Williams' problems were caused by playing year-round, Colangelo said U.S. officials pay special attention to the health of their superstar players in the summer.

WSJ: Colangelo clarifies remarks on Williams' fitness

Both Dr Brady and Dr Aguilar have tried to play ulama themselves, but Dr Aguilar says that, although some of his graduate students persevered for longer, the bruises he sustained from the heavy ball caused him quickly to abandon playing the game.

ECONOMIST: Sports anthropology

Los Angeles (CNN) -- Former linebacker Junior Seau's family sued the National Football League on Wednesday, claiming his suicide last May was the result of a brain disease caused by violent hits he endured playing the game, the lawsuit said.

CNN: January 23, 2013 -- Updated 2220 GMT (0620 HKT)

For years economists and health policy experts have debated how best to level the tax playing field and reduce some of the economic distortions caused by it.

FORBES: How Tax Reform Facilitates Health Care Reform

During the delay, Garcia provided a little more fuel to his rivalry with Woods by suggesting he caused the crowd to cheer as Garcia was playing a shot.

NPR: Sergio Implicates Tiger For Bad Shot At Players