Waiting more than 30 minutes for a pizza. :P

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our feelings.

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Bounded rationality and lack of reasoning skills. So I suppose just cognitive laziness.

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Criticism with no solutions.

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This is the greatest obstacle?

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nah..your answer...which is far superior :P

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Well yours is obviously a worthy obstacle, but I find criticism to be very important to those solutions even if nobody is willing to solve them.

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Human nature.

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The human brain.

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humans, of course<br />
we are truly our own worst enemies.

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Conscience

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Human conservatism

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Human society.

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Muggles!

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