You don't need to have been victimized by the WannaCry ransomware--or worried about hack attacks on presidential elections--to understand that cybersecurity is the most pressing technology problem of our time and may soon become the biggest problem, period. Fending off the onslaught of attacks is a nearly insurmountable task for security professionals. But it's a perfect job for machines that can parse thousands of logs a second and identify potential threats a human might not even see. That's why artificial intelligence (AI) has become a key weapon in the fight against cyber crooks, rogue hackers, and aggressive nation states. But experts also warn that AI is not a magic fix.