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Odd homage to '2001: A Space Odyssey' sees 'Blue Danube' waltz beamed at Voyager 1
The European Space Agency will beam the famous 'Blue Danube' waltz into space
Signal chat app clone used by Signalgate's Waltz was apparently an insecure mess
Waltz's team set up at least 20 Signal group chats for crises across the world
