Is Yuval Noah Harari right? The celebrated science writer thinks that “alien intelligence” will make humans redundant. But some think his claims are too pessimistic.
Aliens will destroy us warns new book

Glossary
Annihilating - Completely destroying.
Medieval - Relating to the Middle Ages.
Homo sapiens - The species to which all modern humans belong. Homo sapiens means "wise man" in Latin.
Democracy - A system of government based on the idea of rule by the people.
Famines - Times of great hunger, when there is very little food.
AI - A computer programme that has been designed to think.
Realm - Kingdom.
Pessimistic - Tending to believe that the worst will happen.
Passive - Accepting or allowing things to happen, without actively responding or resisting.
Nostradamus - A 16-century French astrologer and physician whose prophecies earned him fame both during and after his lifetime. These included being credited with predicting the rise of Adolf Hitler, the atomic bomb and the Kennedy Assassination.
Rasputin - A Russian mystic who gained considerable influence over the last Tsar, Nicholas II, and his family,