Believing is seeing, but seeing isn't necessarily believing: Scientists at UCL reveal a brain link that enables context surrounding an event to often override what we actually see. And a vague background context means that what we think we see is less likely to be what we actually saw than if the background context was bright and well defined. See? It sort of explains why we see imaginary shapes when light is dim. One phenomenon this helps explain is the magic trick -- one ball in the air, then a second, then a third which magically disappears. The third ball isn't actually there -- the repeated motion of the hand and the fact that the balls at that speed at vague, unfocussed objects makes our brains tell us we "see" the third one.
Identical twins not so alike: Identical twins are not genetically identical. Which means -- at least for behavioral and health studies that used identical twins as controls -- environmental factors may have much less power than previously thought. UAB, LeidenU, VU-U, UppsalaU, and Karolinska Institutet researchers studied 19 pairs of monozygotic (one-egg) twins and found differences in copy number variation in DNA.