Are there any substances, other than water, where the solid form is less dense than the liquid? [more inside]
posted on Feb 20, 2007 - 19 answers

Does gravity make small pools of water curve slightly (I’m thinking a small lake size) or is surface tension enough to flatten it out? More importantly - how would I calculate whether the resistance from the surface tension is enough to keep it flat and when/what size that breaks off? [more inside]
posted on Oct 11, 2006 - 19 answers

Why will the ice caps melting cause the sea level to rise? [more inside]
posted on Mar 4, 2006 - 21 answers

Where can I find a non-batshitinsane version of this map? [more inside]
posted on Oct 13, 2005 - 17 answers