Update glossary

docs/glossary/index.md

@@ -9,7 +9,7 @@ has_toc: "false"
 
 |     **Term**                 | **Definition**                                                                                                                                                                                                                                                                                                                                                               | **Examples**                                                                                                                                                                       |
 |:-----------------------------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-|    Physical World            |                                                                                                                                                                                                                                                                                                                                                                              |                                                                                                                                                                                    |
+|    Physical World            |    Contains only fundamental particles. No apples, cars, nothing. Those are abstractions in our world models. In physical world there are only groups of fundamental particles that people refer as apples, no apples themselves.                      |                                                                                                                                                                                    |
 |    World Model               |                                                                                                                                                                                                                                                                                                                                                                              |                                                                                                                                                                                    |
 |    Concept                   |    An abstract idea inside of a world model                                                                                                                                                                                                                                                                                                                                  |     cat, time, running                                                                                                                                                             |
 |    Entity                    |    A Concept that can be acted upon.                                                                                                                                                                                                                                                                                                                                         |    apple, word, time, city                                                                                                                                                         |