The old round up

• Digital Camera crop factors
• 20 things not to do when starting a business - I stayed away from most of them
• More solar power
• via Marginal Revolution -

  The public's opinion of past wars improves as a new war approaches. Thus, after Vietnam most people thought the war was a mistake and this held true for decades until the beginning of the Iraq war when the opinion of war in Vietnam suddenly improved! Even more dramatically, a majority of people thought that World War I was a mistake until World War II approached when the percentage thinking it was a good war doubled.
  

• The worst school murders actually happened in 1927, though it did not involve shootings. It's a horrifying story.