One of the most written-about Renaissance artists, da Vinci may also be among the most poorly understood.

Paris' centuries-old Louvre Museum — home of da Vinci's iconic Mona Lisa — is getting an $800 million makeover, and American visitors will have to help pay for it.

Review by Dan Hofstadter Read the review The restrictions and costs of professional licensing don’t apply only to doctors and lawyers. Hairdressers, decorators and others must deal with them too.