This is a superbly presented history of the long-running debate on what is ostensibly about the nature of time, but in fact is substantially about the relevance and value of different ways of understanding the world, and the extent to which science and philosophy in particular are valid modes of investigating the world and experiences.

Though Bergson and Einstein are at its centre, they are just the core of a complex set of relationships. Canales teases apart several strands - the people (almost entirely men), the institutions, the technologies and objects, historical events - that all play a role in how the debate unfolds over decades. The chapters are kept relatively short and focused, and the narrative shuttles back and forth across time and social groups. (Though it is anchored by a particular date when the Einstein and Bergson met, the 6th April 1922, the richness of the discussion happens elsewhere.)

I learned a lot about a number of different disciplines here, and am motivated to read more about those involved. Highly recommended.