JESS: Bound variable values and facts

[Michael Knapik]

Hello!   I am reading on page 76 in the book Jess In Action on working memory.  About facts.  If one needs to assert a "fact" to add it to memory, what are the bound values of variables?   Like (bind ?x 3)  WRT working memory and facts?  I.e., what is ?x and its value 3?  Are they not in working memory?  When I command Jess (facts) after the aforementioned binding, Jess says there are 0 facts in working memory. Yet I can use the ?x as a "fact"  - a value in "memory" in other expressions etc.   Thoughts?