Driver Reality Check: Earn vs 'Making' Money

To earn a license as a London cabbie, drivers must pass a 161-year-old test called “the Knowledge.” Some candidates spend years studying. Steven Fairbrass has been trying to pass the test for eight years. Anshu Moorjani has been studying for five. For the exam, they have to memorize 25,000 streets, and thousands of landmarks and businesses. They must also know the shortest routes between them all. This memorization has proven to be so challenging that it can change the structure of their brains.