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random (Thu, 13 Mar 2014 12:43:50)
The Electromagnetic Spectrum (Sun, 01 Jun 2014 01:46:03)
whatever (Mon, 14 Jul 2014 15:07:19)
REFLECTION & REFRACTION (Sun, 03 Jan 2016 23:47:40)
The Electromagnetic Spectrum (Tue, 12 Feb 2019 15:30:42)