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

End of the universe scenarios. I'm familiar with the concepts of "heat death" as well as the universe contracting unto another Big Bang. How else might the universe someday become a completely un-survivable place?
posted by scarabic on Sep 9, 2004 - 10 answers