Member since Feb 26, 2009

Barry Evans

Barry Evans lives in Old Town Eureka with his girlfriend (and wife) Louisa Rogers, several kayaks and bikes, and a stuffed gorilla named “Nameless.” A recovering civil engineer, he is the author of two McGraw-Hill popular science books and has taught science and history. His Field Notes anthologies are available... more

Recent Posts

  • A Magical Elk Moment on the Beach

    • Jul 29, 2013
  • Dia de la Virgen
  • Dia de la Virgen

    • Dec 12, 2012
  • More »

    Recent Articles

  • The Voynich Manuscript
  • The Voynich Manuscript

    • Mar 8, 2018
  • Perpetual Motion Machines
  • Perpetual Motion Machines

    • Feb 22, 2018
  • M. Sax's Brass Clarinet
  • M. Sax's Brass Clarinet

    • Feb 8, 2018
  • More »

    Recent Comments

    Re: “Perpetual Motion Machines

    Here is the link:
    And proton half-life = 10^33 years (not 1033!)

    0 likes, 1 dislike
    Posted by barryevans on 02/22/2018 at 4:03 PM

    Re: “M. Sax's Brass Clarinet

    Caption correction: the clarinet has a greater tonal range than the soprano sax

    Posted by barryevans on 02/14/2018 at 8:35 AM

    Re: “M. Sax's Brass Clarinet

    Fascinating link, exhibition of early instruments, NY Met museum:…

    0 likes, 2 dislikes
    Posted by barryevans on 02/10/2018 at 5:39 AM

    Re: “Belphegor's Prime

    Around 300 BC, Greek mathematician Euclid showed that there is an infinity of primes thus:
    Assume to the contrary, that there is a finite list of primes: p1, p2, ..., pr. Let P be the product of this list plus one, i.e. P = ( Now P is either prime or it is not.
    (1) If it is prime, then P is a prime that was not in our list.
    (2) If P is not prime, then it is divisible by some prime, call it p. But p can't be any of p1, p2, ..., pr, since you'd have a remainder of 1. So this prime p is some prime that was not in our original list.
    Either way, the original list was incomplete, hence there's an infinity of primes.

    3 likes, 0 dislikes
    Posted by barryevans on 11/23/2017 at 4:47 AM

    Re: “The Sound of Bells

    Thanks so much for this, Mary Ann--next time I'm down at CR, I'll ask about it.

    Posted by barryevans on 11/21/2017 at 5:55 PM

    Re: “Gravity and Light

    Thanks for this, Don. If both the wavelength and the space between the mirrors are equally stretched, how is it possible to detect anything? Heres my understanding. Its true that the laser beams actually in the LIGO tubes at the moment the gravity wave starts coming through the apparatus see nothing unusual. But gravity waves vibrate about 100 times per second, much slower than the laser light, so fresh light coming into the already-stretched tubes has to travel fartherand its that fresh light that detects the passing gravity wave.

    Posted by barryevans on 11/05/2017 at 1:46 PM

    Re: “Vexed by Vax 'Bias'

    Sorry Linda, much as I admire you and your writing, I'm with Emily 100%.

    2 likes, 0 dislikes
    Posted by barryevans on 09/14/2017 at 6:45 AM

    All Comments »

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