  Wave-particle duality, wave function collapse, objective probability and
nonlocality constitute four prominent puzzles in modern physics. Although these
four topics may appear unrelated, a closer examination reveals that they do
share some common assumptions at the foundational level that have characterized
physics for the last 100 years. Progress can be made on these four topics only
if we understand and possibly revise some long-held assumptions. This essay
examines physics from the ontological perspective. Are quantized matter and
quantized energy both entities and if so what does that imply? Does matter
reside in space and progress in time whereas energy (radiation) resides in time
and progresses in space? If so, what does this tell us? Energy has two
identities, potential and kinetic. Does mass have two identities and if not why
not? The expectation is that answers to these and similar questions will help
us understand the connections between the four puzzles listed above.
