Bobby Knight, center Getty Images

Bob Knight will speak before an audience of thousands the week of the Final Four in April—but at an event that's more ShamWow than slam dunk. The title-winning former Indiana basketball coach will be the keynote speaker at Response Expo 2013, billed as "the country's leading infomercial convention."

Among those expected to be in the audience for Knight's April 2 speech at the Hilton San Diego Bayfront are the people who brought you the Snuggie and the Shake Weight. "No one has the ability to push a team to action like Bob Knight," said Thomas Haire, the event's content director.

Knight couldn't be reached for comment, so it wasn't clear whether he would use the convention to unveil his own million-dollar idea—perhaps a retractable throwing chair.

—Rachel Bachman

Usain Bolt of Jamaica during the 2012 London Olympics Getty Images

U.K. Government Runs Tax Deal Past Bolt

The U.K. government is hoping a tax exemption will tempt Olympic gold medalist Usain Bolt to race again in London. Other than the Olympic Games, Bolt hasn't appeared in a race in Britain since 2009, citing stringent taxation laws.

But U.K. Treasury chief George Osborne has granted a one-off tax amnesty for this summer's London Grand Prix in the hope it will persuade Bolt and other stars to compete.

"The government is determined to do everything possible to secure the Olympic legacy and I am delighted to grant this exemption," Osborne said in a statement. Bolt couldn't be reached for comment.

Under U.K. law, athletes are taxed on their annual income—including sponsorship deals—in proportion to the number of appearances they make in Britain. In practice, this means an athlete such as Bolt, who may race 10 times a year, would be taxed on 10% of his annual income.

—Peter Evans