There are three major ethnic groups in Nigeria (Yoruba, Hausa and Igbo) with about 250 other ethnic groups commonly referred to as minor ethnic groups.

Yoruba culture consists of cultural philosophy, religion and folktales. They are embodied in Ifa divination, and are known as the tripartite Book of Enlightenment in Yorubaland and in its diaspora. Yoruba cultural thought is a witness of two epochs. The first epoch is a history of cosmogony and cosmology.

The culture of Nigeria is shaped by Nigeria’s multiple ethnic groups. The country has over 521 languages and over 1150 dialects and ethnic groups. The rest of Nigeria’s ethnic groups (sometimes called ‘minorities’) are found all over the country but especially in the middle belt and north.

The Yoruba have traditionally been among the most skilled and productive craftsmen of Africa. They worked at such trades as blacksmithing, weaving, leatherworking, glassmaking, and ivory and wood carving.

They are called either Taiwo or Kehinde depending on whether they were born first or second. But even for Yoruba people, Igbo Ora is considered to be exceptional.

The famous legend about everyone having an evil twin is not a completely fictional one. When a set of twins are born, one is always a meaner version of their twin. In early sonograms you can clearly tell one twin has horns and a pitchfork, which are absorbed into his body during the second trimester.

The Kikuyu, Kenya’s most populous ethnic group, practiced ritual killing of twins. Infanticide is rooted in the old traditions and beliefs prevailing all over the country.

The firstborn of the twins is known as Taiwo while the second one is called Kehinde. In Yoruba culture the second born twin is considered the elder twin; Taiwo is sent out by Kehinde first to judge if the world is safe and beautiful.

In both surveys, twins scored about 5 IQ points (one third of a standard deviation) lower than singletons. This is supported by a Dutch study of adult twins, which found no significant difference in IQ between singletons and twins from the same families.

It is the Sambisa Forest, home to large populations of African wildlife — monkeys, antelopes, elephants, ostriches, poisonous snakes — and, for a century or more, robbers and smugglers who found easy passage into Cameroon.

The lower intelligence of twins in childhood may partly be a consequence of the reduced fetal growth and shorter gestations of twins, say the authors.

Genes have a very strong influence over how certain parts of our brains develop, scientists in the US and Finland have found. In identical twins, these areas showed a 95 to 100 per cent correlation between one twin and the other – they were essentially the same. …

Most previous studies reported that twins have lower cognitive ability than singletons. In a very large study of children born in Birmingham, United Kingdom, between 1950 and 1954, twins had a deficit in verbal reasoning scores at age 11 of 4.4 points on average.

By then they had measured the IQ of 48 pairs of monozygotic, or identical, twins, raised apart (MZA) and 40 pairs of such twins raised together (MZT). The MZA twins were 69% similar in IQ, compared with 88% for MZT twins, both far greater resemblances than for any other pairs of individuals, even siblings.