It is certainly difficult (even for a physical specialist of high cognitive capacity) to have a total understanding of the universe. There are many variables involved in attempts to 'discover' the physical universe and therefore, many theories about the creation, composition, purpose and development of the cosmos have been developed (and many are still in development). Concerning that, The Theory of Relativity (Albert Einstein); studies on Celestial Mechanics (Isaac Newton), the ideas of quantum mechanics (Planck and others) and, more recently, the development of the concept of the Inflationary Universe (Alan Guth) should be remembered.
President Emmanuel Macron has called NATO "brain dead", claiming it should focus on real threats and reinvent itself. To what point is this the case?