An undated handout photo shows a cat and a brown mouse within an inch of each other. Fear may be linked to the sense of smell, and can be switched off simply by shutting down certain receptors in the brain, Japanese scientists have found. In an experiment with mice, the researchers identified and removed certain receptors on the olfactory bulb of their brains -- and the result was a batch of fearless rodents. (Source: Dayoo.com)

An undated handout photo shows a brown mouse playing under a cat. Fear may be linked to the sense of smell, and can be switched off simply by shutting down certain receptors in the brain, Japanese scientists have found. In an experiment with mice, the researchers identified and removed certain receptors on the olfactory bulb of their brains -- and the result was a batch of fearless rodents.(Source: Dayoo.com) An undated handout photo shows a brown mouse playing with the collar of a cat. Fear may be linked to the sense of smell, and can be switched off simply by shutting down certain receptors in the brain, Japanese scientists have found. In an experiment with mice, the researchers identified and removed certain receptors on the olfactory bulb of their brains -- and the result was a batch of fearless rodents. (Source: Dayoo.com) An undated handout photo shows Japanese researchers holding containers with mice. Fear may be linked to the sense of smell, and can be switched off simply by shutting down certain receptors in the brain, Japanese scientists have found. In an experiment with mice, the researchers identified and removed certain receptors on the olfactory bulb of their brains -- and the result was a batch of fearless rodents. (Source: Dayoo.com)