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According to Charles Darwin's theory of evolution, only the fittest survive. Here's how it works in the business world. Charles Darwin would have built a killer company.

The conventional wisdom is that it always makes sense to reuse or remake products rather than to make new ones--why make a new tire when you can retread an old one, and why manufacture a new inkjet cartridge when you can refill a used one? But conventional wisdom is often wrong. In some cases, it may actually be more resource and energy-efficient to manufacture new products, according to a new study from MIT

Want to know what's behind your energy bill? According to new numbers from the U.S.