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1. Silicon Valley is wherever you want it to be. Entrepreneur Brad Feld explains why we shouldn't feel compelled to move somewhere just because people say its full of opportunities. 

2. Darwin's theories don't apply to us anymore. Author and investor Juan Enriquez argues that from cows to corn to cities, humans have now moved beyond natural selection. 

3. Cars, coal…concrete? Daniel Gross takes a look at an under-the-radar substance that’s destroying the environment.