Sabine Hossenfelder’s science without the gobbledygook videos are fantastic. This one
addresses the question:
What is space-time? What is a particle? I get these questions a lot. My best answer is “math”. But does this mean that mathematics is real? Are we maybe even made of math? Or could it even be, as Max Tegmark has argued in his “mathematical universe Hypothesis”, that all of math is real? In this video I go through what we know and what we don’t know.