Tuesday, April 29, 2014

Why don't fish crash into the side of the fishbowl?

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After reading yesterday's Drabble comic:

I started wondering how it is that fish don't crash into the side of the tank. After all, they have no binocular vision, and their brain can't possibly be big enough to learn about things like invisible barriers.

Google to the rescue. A quick search ran across an article from The Straight Dope which spells it out:

The fish aren't using their eyes to "see" the glass, but rather a special pressure-sensing system called the lateral line. This system is made up of sensory units called neuromasts, consisting of cells on the body surface that have a projecting hair encased in a gelatinous cap. When pressure waves in the water move the gelatinous caps and bend the hairs, the firing rate of nerve impulses sent to the brain by the neuromasts changes, enabling the fish to detect the waves.
Fish set up pressure waves as they move through the water, and are able to detect the reflection and distortion of these waves from objects and thereby avoid them. They are also able to detect the pressure waves of other fish.

That's really awesome. Who'd have thought that a silly comic would lead to learning such interesting trivia. Go read the rest of the article for more interesting related facts.

Monday, April 28, 2014

What <insert meme here> are you?

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On The Fastrack comic for April 28, 2014:

And just for kicks, here are my answers. No I'm not going to hunt down a bunch of quizzes. These are just the answers I would give if asked the questions. Make of that what you will.

  • Star Trek character: Chief O'Brien
  • Lord Of The Rings character: Frodo
  • Harry Potter character: Arthur Weasley
  • Star Wars character: Obi-Wan Kenobi
  • Disney Princess: Fa Mulan

Friday, April 11, 2014

IETF: Yahoo breaks every mailing list in the world including the IETF's

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h/t Hacker News

Yahoo recently upgraded the "security" of their mail servers in an attempt to curb spam. Unfortunately, they decided to use a protocol that is still under development, has serious known problems, and they configured it for maximum paranoia. The result is that they reject nearly all mailing-list traffic (legitimate or otherwise) that comes from a Yahoo user, potentially crippling the lists themselves. (Except for lists hosted by Yahoo's own servers, of course.)