How can it be that there exists not a single example of a working wheel in nature, which after all gave us (among other things) the eyeball?
posted on Sep 23, 2007 - 41 answers

If we can't use all of our brain's potential, why does that potential exist? [more inside]
posted on Mar 10, 2007 - 22 answers

What experiments have been carried out where animals perform better than us at particular cognitive tasks? [more inside]
posted on May 9, 2006 - 13 answers

Why did consciousness evolve? [more inside]
posted on Jan 25, 2006 - 39 answers

Are there any animals that have evolved a use for radioactivity? If so, what ways is it used? If not, why has this not happened? [more inside]
posted on Nov 23, 2005 - 32 answers