In making the case for the Human Brain Project back in 2009, neuroscientist Henry Markram noted that 2 billion people are affected by some kind of mental disorder. It was time, he said, to explore fundamental questions about how the brain works. The collaboration that resulted involved hundreds of scientists across several nations. This week marks the end of Europe’s ambitious but also at times controversial initiative. Marketplace’s Lily Jamali spoke with Miryam Naddaf, a reporter for the publication Nature, about what the project’s researchers have accomplished.