  This article is an attempt for a new vision of the basics of Physics, and of
Relativity, in particular. A new generalized principle of inertia is proposed,
as an universal principle, based on universality of the conservation laws, not
depending on the metric geometry used. The second and the third principles of
Newton's mechanics are interpreted as logical consequences. The generalization
of the classical principle of relativity made by Einstein as the most basic
postulate in the Relativity is criticized as logically not well-founded. A new
theoretical scheme is proposed based on two basic principles:
  1.The principle of universality of the conservation laws, and
  2.The principle of the universal velocity.
  It is well- founded with examples of different fields of physics.
  Key words: Universality, New Insight in Physics
