In August, Venus the two-faced cat became a feline hit: The three-year-old tortoiseshell debuted her own Facebook page, was featured in a YouTube video, and appeared on the Today Show. One look at this cat and you can understand why: One half is solid black with a green eye, and the other half has typical orange tabby stripes and a blue eye. The coloration may be a genetic mashup that one scientist called “absolute luck.