Conservation of energy is my favorite. Penrose claims the universe recycles itself but it goes through phase of complete erasure of the past. He also claims that in the erasure the universe passes through a massless form where time becomes meaningless. Time has multiple beginnings in his view, as I see it, that makes time multidimensional I suppose, but frankly his timelessness concept appears to me to be most likely agenda-driven. He is apparently talking about a phase continuous in a line with low-energy-density (heat death), so why the alleged universal massless energy phase would not be occupied by particles moving light-speed and thus marking time is not appreciated here. Still it suggests the universe has always been around, and I don't see where Penrose can rule out infinite energy.