Quote Originally Posted by JohnDo View Post
Why do Russian experts believe that type is genetically determined?
Probably because they observed enough identical twins who are the same type. Some Russian speakers could certainly find it out...
If you ask midwifes, they claim they have observed that during full moon, significantly more baby boys are born. But until this has been proven using scientic procedures, this is a hypothesis at best. And guess what: it has been disproven!

Show me the results of scientific research! Referring to 'the Russians' doesn't make it true, and I wouldn't be surprised when 'the Russians' never made such claims.