SciShow

SciShow

A Brief History of Timekeeping (2015x92)


Date de diffusion: Jun 25, 2015

It’s time for another leap second! Join SciShow as we celebrate by exploring the long and strange history of timekeeping.

  • Première: Jan 2012
  • Épisodes: 3680
  • Abonnés: 2
  • En cours
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