Why Iyengars are...

Why Iyengars are more intelligent than Iyers ? Is it because they don't add salt to thairsadam? or, while Iyers have two cycles( dwijans) , Iyengars have completed more cycles of rebirths, or is it because Iyers eat banana chips even when they chant Gayathri manthra or is it because Iyengars have a large "thrishul pottu" and holy ashes on palms and chest ,and holy thread while Iyers have just an "unwashd"thread? or is it because Iyengar babies have more manthra japa lessons than Iyer kolanthais? or...