"What's life for if there's no time to play and explore?" In The Weirdness of the World (Princeton UP, 2024), Eric Schwitzgebel invites the reader to a walk on the wilder side of philosophical speculation about the cosmos and consciousness. Is consciousness entirely a material phenomenon? How much credence should we have in the existence of a world outside our minds? Are there multiple parallel universes? Schwitzgebel, a professor of philosophy at the University of California-Riverside, constructs chains of conditional probabilities to explore the zone just beyond the edge of what we can understand, however imperfectly, given current scientific theory. He distinguishes hypothetical scenarios that are not worth taking seriously – like being a brain in a vat – from those that are just plausible enough to deserve playful, yet motivated, consideration.

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