Just putting it out there - the Starblast 4.5 EQ is about the single best introductory telescope out there dollar-for dollar. Despite being so cheap, it has a parabolic primary, which sharply reduces aberrations, especially given its fast focal length. » 3/04/14 11:56am 3/04/14 11:56am

I agree with both points. There's something about the physical act of writing information down that makes it more easily retained, which is why I held out on pen-and-paper notes while everyone moved to using iPads. (I've recently replaced all my notebooks with a Surface Pro, but that's because the Surface Pro uses a… » 2/03/14 2:56pm 2/03/14 2:56pm

A Planck length, ~1.616e-35 m, is the shorted length that could possibly be measured with any real meaning (due to quantum stuff that I'm not familiar with). The shortest meaningful time, then, is the Planck time, or ~5.39e-44 s, the time it takes light to travel one Planck length. » 1/02/14 9:58am 1/02/14 9:58am