A paradox of physics is: Physics is time-symmetric, Nature is not. Roger Penrose lists 7 ways in which Nature distinguishes the past from the future. The seven arrows of time are: The subjective arrow of time. (We don’t remember the future) The radiation arrow...
In physics, the fundamental interactions, also known as fundamental forces, are the interactions that do not appear to be reducible to more basic interactions. There are four fundamental interactions known to exist: the gravitational and electromagnetic interactions,...
