Mid-Day Links

1. Travelers dilemma. Fascinating stuff in the Scientific American.

2. A tale of two cities. (It’s not just Baltimore. This is increasingly becoming the norm for American cities—one portion a playground for the rich, the other a violent underserved ghetto.)

3. EveryBlock.com is the future of local journalism. Just you wait.

Chris Hayes is the host of All In with Chris Hayes on MSNBC.

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