Macrinus (Latin: Marcus Opellius Severus Macrinus Augustus; ca. 165 – June 218), was Roman Emperor from 217 to 218. Macrinus was of Berber (Indigenous people of North Africa) descent and the first emperor to become so without membership in the senatorial class.

Born in Caesarea (modern Cherchell, Algeria) in the Roman province of Mauretania to an equestrian family, Macrinus received an education which allowed him to ascend to the Roman political class. Over the years he earned a reputation as a skilled lawyer. Under the emperor Septimius Severus he became an important bureaucrat. Severus' successor Caracalla appointed him prefect of the Praetorian guard.

While Macrinus likely enjoyed the trust of Caracalla, this may have changed when, according to tradition, he was prophesied to depose and succeed the Emperor. Rumors spread regarding Macrinus' alleged desire to take the throne for himself. Given Caracalla's tendency towards murdering political opponents, Macrinus probably feared for his own safety should the Emperor become aware of this prophecy. According to Dio, Caracalla had already taken the step of re-assigning members of Macrinus' staff.

Alberto Angela (born 8 April 1962) is an Italian paleontologist and scientific popularizer.

Alberto Angela was born in Paris.

He accompanied his father, the well-known Italian TV announcer Piero Angela, on his trips ever since he was a child, something that allowed him to learn many European languages and to appropriate a cosmopolitan culture. After being a student in France, he enrolled in a course of Natural Sciences at the University "La Sapienza" of Rome, finally graduating with 110/110 and a prize for his thesis. He studied different courses of specialization also in an American university. Once out of university he started working in the research field participating in paleoanthropologic digs in various places in the world, among which Zaire, Ishango, Tanzania, Olduvai and Laetoli, Sultanate of the Oman, Mongolia, and the desert of the Gobi.

In 1988 he published an essay on the new techniques of interactivity in scientific museums, entitled Musei (e mostre) a misura d'uomo. Come comunicare attraverso gli oggetti. Together with his father he has written various books of scientific subjects: La straordinaria storia dell'uomo (Mondadori, 1989), La straordinaria storia della vita sulla Terra (Mondadori, 1992), Il Pianeta dei Dinosauri (Mondadori, 1993), Dentro al Mediterraneo (Mondadori, 1995), La straordinaria storia di una vita che nasce - 9 mesi nel ventre materno (RAI-Eri-Mondadori, 1996), Squali (Mondadori, 1997), Viaggio nel Cosmo (Mondadori, 1998).