The Nub Theory, does what it says on the tin. It is a theory. When it might sound slightly wishy-washy, you can find studies to back it up. A 2016 study looked at the precision on the Nub or 'Nib' theory and the effects were being astonishingly precise. That is https://early-pregnancy-gender-si01098.dreamyblogs.com/28173939/ramzi-gender-theory-secrets