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World 5 · Quartz and Beyond · 12 min · PRO

Radio-controlled and eco-powered

Tying a quartz clock to something better

PRO · Clockwork & Time

World 5: Quartz and Beyond is part of PRO

The first world of Clockwork & Time is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • A crystal that squeezes back
  • How accurate is quartz?
  • The quartz revolution
  • Defining the second
  • How an atomic clock works
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

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