Nikola Tesla once paid an overdue hotel bill with a ‘working...

Nikola Tesla once paid an overdue hotel bill with a ‘working model’ of his ‘death beam’. He warned the staff never to open it, describing it as a war-ending particle weapon that could stop invading armies and make warfare pointless.

After his death in 1943, someone finally pried the box open and found nothing but a bunch of harmless old electrical components.

(Source, Source 2)

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