Scientists have created a mouse that's permanently happy. The mouse lacks the TREK-1 gene, which affects the transmission serotonin in the brain, and as such doesn't suffer from depression (which, presumably, normal mice do):

Mice without the TREK-1 gene ('knock-out' mice) were created and bred in collaboration with Dr. Michel Lazdunski, co-author of the research, in his laboratory at the University of Nice, France. "These 'knock-out' mice were then tested using separate behavioral, electrophysiological and biochemical measures known to gauge 'depression' in animals," says Dr. Debonnel. "The results really surprised us; our 'knock-out' mice acted as if they had been treated with antidepressants for at least three weeks."

Want to say something? Do so here.

Note to spammers: This comment system applies the rel=nofollow attribute to the poster's URL and all links. Posting links to this page will not improve their search engine rankings.

Display name:
URL:(optional)
To prove that you are not a bot, please enter the text in the image on the right in the field below it.

Your Comment:

Remember my details.

Please keep comments on topic and to the point. Inappropriate comments may be deleted.

Note that markup is stripped from comments; URLs will be automatically converted into links.