The study, which compared fMRI brain scans of dogs and humans, showed that dogs respond most to sounds from other dogs, and humans to the voices of other humans.
Scientists are still investigating the nature of the mysterious rock, which created a hole in the roof - and interior damage - in a house in Sri Lanka.
New research by scientists studying environmental damage from the 2010 Deepwater Horizon oil spill explains why crude oil causes heart failure in fish.