A professor in the middle of a lecture unbuttoned his shirt and rebuttoned it several times in rapid succession, started to sing, and then ran out of the room. He was discovered several hours later sleeping in the rain on a bench in front of the university library. He could not remember his classroom behavior, and he had no idea how he had fallen asleep in the rain. The professor may have experienced:

A complex partial seizure

Explanation:

The seizure is a complex brain problem. It is a neurological disease. If a person has seizures, needs immediate treatment. It occurs without any indication.  

Symptoms :  

Thus here the professor was suffering from a partial seizure that creates a problem for him. Even he forget what he did in the past. It affects his episodic memories.

the arab empire adopted the muslim religion as their main belief. arabs would influence the people from the territories they invaded towards islam (the muslim belief).

nevertheless, throughout the history of the arab empire, rulers brought intellectual individuals from other religions to their centers of learning. these other foreigners included jews, christians, greeks, persians, and indians.   these resulted in the adoption of important knowledge developed by these cultures by the arabic empire. for example, the works of aristotle were translated from greek to arab and indian scientists brought the numerical concept of "zero" to the arabs.

nowadays, 93% of the arab population is muslim, which at the same time is subdivided in sects including the sunni, zaini, alawi, shia. the remaining 7% is composed mainly of christians.