Dennis Crowley: Stop sketching. Start building.

Don't you hate it when you had the idea for something, and someone else went ahead and made it before you? That sucks, and the only one at fault here is you. That's why you should just get on it as soon as you have an idea. Having a prototype, no matter how flawed, is 100x better than just having an idea. What's the point of having an amazing idea, if you don't have anything to show for it?

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