<human>:  I have a question about the Theories of everything. When you say that they are “theory of everything”, what do you mean?
<bot>: Theory of everything is a term used to describe a theory that explains everything. It is a very ambitious goal, but there are many different theories that try to explain everything. For example, the Standard Model of particle physics is a theory of everything. It explains the fundamental particles and forces of nature, and it is the most successful theory of all time.