In sub-Saharan Africa, genes favour tight, curly hair. But in east Asia, mutations have led to straighter, thicker hair. In Europe, other mutations brought wavy and straw-coloured hair.

In psychoanalytic theory, the Jocasta complex is the incestuous sexual desire of a mother towards her son.

Mandel: A mama’s boy can most definitely be rehabilitated, but only if he’s willing to acknowledge that his relationship with his mom is unhealthy and needs to be restructured.

The fact that a man’s relationship with his mother can have a big impact — in either a good way or a bad way on his relationship with you. If the boy’s dad orders the mom around, abuses her or treats her poorly, the boy could end up thinking this is acceptable, normal behavior.

A few weeks ago, the strange love story between a woman and her son-in-law hit headlines but now there’s a whole new twist to the unusual love story. Twenty-year-old Suraj Mahto, from Puraini village in Bihar’s Madhepura district, betrayed his wife and married his 42-year-old mother-in-law, Asha Devi.

Years passed, during which Oedipus had four children with Jocasta. Oedipus found out that he killed Laius, his father, and married his mother, Jocasta.

Examples of incestuous marriages and the impact of inbreeding on royal families include: All rulers of the Ptolemaic dynasty from Ptolemy II were married to their brothers and sisters, in order to keep the Ptolemaic blood “pure” and to strengthen the line of succession.

In- deed, probably a majority of 18th Dynasty kings (1570-1397 B.C.) married their sisters or half sisters: Tao II, Ahmose, Amenhotep I, Thutmose I, Thutmose II, Thutmose III, Amenhotep II, and Thutmose IV.

However, scholars agree that during the first two centuries A.D., in Roman Egypt, full sibling marriage occurred with some frequency among commoners as both Egyptians and Romans announced weddings that have been between full-siblings. This is the only evidence for brother-sister marriage among commoners in any society.