Here is a quick read from Jeff Atwood that all developers should read: Assertiveness for Software Developers. Jeff brings up a great point, developers aren't assertive enough; and that ends up biting us later (I know it's bitten me a few times).
This is well worth reading, and well worth some serious thought for next time your manager hands you an impossible deadline.
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Nice find. This reminds me of a tangentially related article I read recently here.
Thanks for sharing.