Parents argue that the sport is still a good way to learn discipline, self-confidence and self-reliance.

WSJ: How Squash Got Serious

But we are happy, we learn discipline.

BBC: News | NEWSNIGHT | Military academies transcript

The British Medical Association (BMA) said sports such as boxing and cage-fighting were "sometimes defended on the grounds that children learn to work through their aggression with discipline and control".

BBC: Boys' fight in cage 'very barbaric' says Jeremy Hunt

Rather, B-schools should be encouraging students to learn the boring, but critically important, discipline of business valuation.

FORBES: If you value your business, you should value your business

Obviously, focusing on one discipline will increase your power faster than if you tried to learn to be a thief, then a mage, then a fighter.

CNN: SHARE THIS

This required a cross-discipline education including nursing, psychology, material science and whatever else was required to help machines learn about the real world.

WSJ: The Weekend Interview With Sebastian Thrun: What's Next for Silicon Valley?