Help me understand the efficacy of a headbutt as an offensive opening gambit in a bout of fisticuffs... [more inside]
posted by dougrayrankin on Feb 24, 2011 - 27 answers

What might |000> + |111> mean, on a garden gate? [more inside]
posted by daisyk on Dec 12, 2008 - 13 answers

I'm on the hunt for sites and/or blogs about big ideas... Who wants to join me? [more inside]
posted by 0bvious on Jul 9, 2006 - 17 answers

Two objects, both mass 1kg are placed 1m apart in a total vacuum. How long would it take for the force of gravity to pull them together (assuming no other forces act)? [more inside]
posted by alby on Jan 4, 2006 - 51 answers