Some of the questions that modern physics and science is unable to answer:
What
is time
is space
Planck's constant
is mass
is matter (electrons, protons ...)
is charge
is spin
gravity
is electromagnetism
are photons
is life
is dark energy and dark matter
are the causes of quantum paradoxes
Some answers on these questions are provided by current physics in terms of mathematical formalisms, but they do not provide true insight in nature.
Why
is the speed of light an upper limit for physical interactions
does the universe exist
does the universe seem to expand (does it really?)
How
is life created