Carbon dioxide isn't the only greenhouse gas out there. Other substances, such as water vapor and nitrous oxide, also trap heat to varying degrees.

I do think that fashion may end up being the 'killer app' for wearable augmented reality systems. This is in part because it's not simply task-oriented - like finding a restaurant or where your friend is currently lounging about - but experience-oriented. It becomes part of your life.

Is there a better example of natural selection in action than 'Project Runway?'

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