Rapid eye movement may indicate neural activity, but dreaming for me implies a conscious awareness of the dream state, which I consider as unlikely in spiders.
A recent research article from Germany has made quite a splash in the popular media and raises some very interesting questions about animal minds.
The changes in human heads were not driven by a changing brain, researchers say. It was the human face that changed.
As we learn more from research about how various life forms respond to experiences, a more complex picture may raise political issues.
Not much is known for sure about how dogs age. The Dog Aging Project aims to change that through systematic research programs.