How many threads does Clojure's pmap function spawn for URL-fetching operations?

If you check the source you see: > (use 'clojure.repl) > (source pmap) (defn pmap "Like map, except f is applied in parallel. Semi-lazy in that the parallel computation stays ahead of the consumption, but doesn't realize the entire result unless required. Only useful for computationally intensive functions where the time of f dominates the coordination overhead." {:added "1.0"} ([f coll] (let [n (