Abstract
I argue that what is ultimately possible in physics will ultimately depend on the willingness and ability of individual physicists to seriously concern themselves with the question of whether a theory's physical foundations and assumptions actually correspond to Nature or not. Several examples in modern physics related to the topics of time and space-time are discussed where I feel this issue to be especially pertinent, including the existence of spacetime, the theory of cosmic inflation, the standard interpretation of the 'block' view of time provided by relativity, the theory that time and space are quantized, and thermodynamic time reversal. I conclude with some comments about Albert Einstein, a physicist I believe physics can today still learn much from, not just for his theories and ideas, but also from his approach to physics.
Peter Lynds