I quote: " Compared to domestic honey bees, the Russian bees are more than twice as resistant to attack by varroa mites, according to tests by geneticist Thomas E. Rinderer and colleagues at ARS' Honey Bee Breeding, Genetics and Physiology Research Unit in Baton Rouge, La. " end of quote. As I understand the bees from Russia was imported because the domestic bees (and other world wide A. mellifera population as well) have zero resistance to varroa. I'm slightly confused. Can someone kindly explain for me what is 'twice better than zero' ? (2 x 0 = ?.....) How many times the bee must be resistant - compared to not resistant bees - to be genuin resistant as A. cerana is? Means - to be able to keep the varroa population at the 'bee survive level' without any anti varroa treatment. I'm be able to understand a comparison against A. cerana (40% of cerana resistance or 80%... etc), but I have some difficulties to understand this kind of mathematics (2 x 0). Thanx \vov