No mouse should look into that "I'm gonna chomp you" face and not run squeaking in the other direction. And yet a mouse has done it, thanks to a team of Japanese researchers who genetically engineered it to not fear cats.

Scientists claim the cat-friendly mouse they built (pictured) is proof that some fears are written in our genes. So when are they going to knock out the human gene for fearing oppression and create a race of super-obedient service workers? Image by Ko and Reiko Kobayakawa, Tokyo U, via Associated Press. Genetically-engineered mice [via National Geographic]