The cardboard rocket should be able to fail fast and cheap; otherwise, you will die trying. 2. Ideas float in the air, reaching us all. Everyone can think of them, but ideas only belong to those who develop them, and often it's more than one person. 3. You are probably wrong if you think your rocket is unique. Somewhere in the world, someone has already thought about it. But this isn't what matters; what matters is not to lose the ambition to fly because that drive will give you the tenacity to redraw your rocket as many times as possible. 4. The startup world is vast and complex. Yo never stops learning.