links for 2009-04-28

• Common Sense for Uncommon Physics | Cosmic Variance
  Tricks to get 'a feeling' for very large or small quantities. I learned from this post that light travels a foot per nanosecond (12 million miles a minute, according to Monty Python) and that
  "the sensitivity of the human eye is such that it can see a match flame from a mile away"
  and …
  "an ultra-high-energy cosmic ray has about the same energy as a good fastball."
  (tags: physics)

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