MOUNTAIN VIEW, CALIF. — So Google bought smart thermostat maker Nest Labs for $3.2 billion. That’s a lot of dough that’s hard to justify with the hardware involved, so the $3.2 billion isn’t about selling widgets. It’s about access into consumers’ homes. On the surface the transaction makes a lot of sense for both parties. Nest Labs co-founder Tony Fadell told Fortune magazine that he and his partners — many of them ex-Apple engineers — want to ...

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