"Those who have called themselves fascists have had many different views, and they have often evolved over time, " said Passmore, Reader in History at Cardiff University in Wales and the author of "Fascism: a very short introduction".

CNN: 'Fascist' Di Canio polarizes opinion

Bill McGuire, professor of geophysical hazards at University College London, has written a book entitled Global Catastrophes: A Very Short Introduction in which he calculates the size of objects big enough, if they struck Earth, to end life as we know it.

FORBES: Magazine Article