Indeed, NRG's CEO David Crane recalls the first time he visited Nest at its Palo Alto headquarters, where the parking lot is ringed with high-speed auto charging ports.

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If a cowbird female fails to lay in a warbler nest in time for her egg to hatch with those of the host, she can reset the clock in her favour by killing the first clutch.

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All leftover funds roll over into the next year, allowing employees to build a nice nest egg over time.

FORBES: Uncommon Sense