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Approximately 300,000 neurons from a rat fetus are deposited onto a sheet of nutrients and electrodes (and MEA, or multi-electrode array) and the neurons immediately begin to build connections to each other and to the electrodes.
 robot rat brain
Cats, rats and other predators produce a chemical signal that terrifies mice, according to new research. Scientists in the US discovered that when mice detect specific proteins found in cat saliva and rat urine they react with fear. These proteins, called Mups, act on cells in a special sensory organ in the mouse, called the vomeronasal organ.

2010-05-17

 smell pheromone cat mouse rat saliva protein detection fear predator
The local farmers call it a flood; an inundation that happens every 50 years. Others believe it to be an act of God, an inevitability. It isn't water flooding the precious farmland in north-eastern India, but rats. A once in a generation, gigantic plague of rats, that ruins crops and leaves people starving. A rat army so big, so mythical, that until now some scientists did not believe it was real...

2010-11-19

 rat India flood overpopulation Burma Myanmar plague pest
The sense of smell can be improved through training, a study on rats suggests. The study also suggests if we do not use our sense of smell, we begin to lose it.

2011-11-21

 smell olfaction nose brain training rat