14 NOV 2014 by ideonexus

 How long is a second?

Electronic/World Wide Web>Internet Article:  O'Callaghan, Jonny (February 18, 2012), How long is a second?, Retrieved on 2014-11-14
  • Source Material [www.howitworksdaily.com]
    • Folksonomies: time measurement
    Folksonomies: time measurement
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