When China deploys warships to the Taiwan Strait or when it funds a port in Hambantota or finances a railway through the Sahel, the world notices. But when Beijing rewires how populations think, what they fear, and who they trust, the world largely looks away. This is Cognitive Warfare, the world's most consequential battlefield of the 21st century, the one that's least understood. Illustration by The Geostrata China calls it ‘public opinion warfare,’ which is one of the thre