surveillance

Brain-computer interfaces are already decoding thoughts into words. What happens when the technology scales — and who gets to see what you're thinking?

Machine learning can scan news and travel data for outbreak signals, forecast cases weeks ahead, and track viral genomes. It cannot say when the next pandemic starts.

North Korea's internet is accessible to fewer than 1,000 people — everyone else uses a sealed domestic intranet. China's Great Firewall blocks 10,000+ websites. Iran blocks 50% of the world's top websites. Here are the countries with the most internet censorship.