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AT&T Archives: The Step-By-Step Switch8:26

AT&T Archives: The Step-By-Step Switch

774K views • 15 years ago
AT&T Tech Channel
A 1951 Bell System training film showing how telephone calls are routed through a step-by-step (Strowger) switching office.
The centuries-old debt that's still paying interest3:58

The centuries-old debt that's still paying interest

9.3M views • 9 years ago
Tom Scott
Tom Scott visits Yale's archives to look at a 367-year-old bond from a Dutch water authority that is still paying interest. Finance professor Geert Rouwenhorst explains how it works.