The whole story of how his personal monogram ended up on every wireless device on the planet is one of the more genuinely accidental facts of the modern technology industry. One of the kings in the book was Harald Bluetooth. Harald Bluetooth did not know his initials would end up in the pocket of every person on the planet. Kiran Athar is not a historian or a technology industry analyst. She writes about history, technology, and the ordinary corners of modern life where the two intersect, drawing on peer-reviewed research and primary-source scholarship.