One of the amazing ideas to emerge from Einstein’s theory of general relativity was the possibility of gravitational waves rippling their way across the cosmos. It took a century to verify this prediction. Their existence was finally confirmed by LIGO (the Laser Interferometer Gravitational-wave Observatory) in September 2015.
Michael Faraday transformed our understanding of the physical world when he realised that electromagnetic forces are carried by a field permeating the whole of space. This idea was formalized by James Clerk-Maxwell who constructed a unified theory of electromagnetism in which beams of light are undulations in the electromagnetic field. Maxwell’s theory implies that visible light is just one part of the electromagnetic spectrum.
Voltaire is known today for Candide, a short novel published in 1779. The young hero Candide travels the world in a tale littered with rape, murder, pestilence, enslavement, and natural catastrophe. Amidst this apocalyptic nightmare, Candide’s tutor Dr Pangloss maintains a philosophical detachment, arguing against all evidence to the contrary that we live in the best of all possible worlds.