As someone whose long-ago master's thesis was on the evolution of intelligence, I have always maintained an interest in cognitive studies of non-human species. So I was pleased to see this recent article in the Telegraph about the latest experiments with fish. Not that the results surprise me in any way; we shouldn't actually need to be constantly reminded that other species have certain abilities in the way of specific memory tasks - such abilities only impress us because we consistently underestimate the abilities of every other species but our own.

A rat study has found a positive feedback level between stress hormones and activation of the hypothalamus, suggesting why agressive behavior escalates so quickly, and is so hard to stop.

The latest Scientific American has an article about why we dream.