Yuval Harari is a global intellectual. And the internationally bestselling author is worried: our brains are getting hacked. Artificial intelligence, biotechnology and ever-sophisticated algorithms are tapping into our values, habits, tastes, desires and the very thought patterns that define us - all to control how we shop, what we read, and whom we vote for. The notion of free will is defunct. And the grand project of liberalism, with its focus on the individual, is worn out. But in this exclusive interview with Paul Kennedy, he explains why he remains cautiously optimistic about humanity's future.