diff --git a/src/koans/10_runtime_polymorphism.clj b/src/koans/10_runtime_polymorphism.clj
index 8be1c6a..256daeb 100644
--- a/src/koans/10_runtime_polymorphism.clj
+++ b/src/koans/10_runtime_polymorphism.clj
@@ -10,19 +10,19 @@
                    "!")))
 
 (defmulti diet (fn [x] (:eater x)))
-(defmethod diet :herbivore [a] __)
-(defmethod diet :carnivore [a] __)
-(defmethod diet :default [a] __)
+(defmethod diet :herbivore [a] (str (:name a), " eats ", "veggies."))
+(defmethod diet :carnivore [a] (str (:name a), " eats ", "animals."))
+(defmethod diet :default [a] (str "I don't know what ", (:name a), " eats."))
 
 (meditations
   "Some functions can be used in different ways - with no arguments"
-  (= __ (hello))
+  (= "Hello World!" (hello))
 
   "With one argument"
-  (= __ (hello "world"))
+  (= "Hello, you silly world." (hello "world"))
 
   "Or with many arguments"
-  (= __
+  (= "Hello to this group: Peter, Paul, Mary!"
      (hello "Peter" "Paul" "Mary"))
 
   "Multimethods allow more complex dispatching"