Philosophy of Time

If Bob Dylan’s right, “the times they are changing”. But what is time anyway? We usually carve up time in terms of the past, the present and the future. But are all of these temporal divisions on an equal ontological footing? Or is there something ontologically special about the present moment, the now? If so, how should we conceive of the past and the future? Are they real? Does time really flow (like we think it does)? And what’s the relationship between space and time? Are the laws of physics time reversible? Is time travel possible? 

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GRS Episode, Metaphysics, Philosophy of Time