Fun fact I did not know until today: Bluetooth is named after Harald Bluetooth, former king of Denmark, father of Sweyn Forkbeard, grandfather to King Cnut. The Bluetooth logo is a combination of runes for H and B, for Harald Bluetooth (he had a dead tooth which was blue/grey).
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@Strandjunker - in the late 90s I was at the Erickson plant in Sweden. One of the guys there told me "this thing is going to be HUGE. It's going to change everything. It's called Bluetooth."