diff --git a/src/main.rs b/src/main.rs
index 1b898a0..c397617 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -18,9 +18,9 @@ impl Add for Point {
 }
 
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 struct Millimeters(u32);
-#[derive(Debug)]
+#[derive(Debug, PartialEq)]
 struct Meters(u32);
 
 impl Add<Meters> for Millimeters {
@@ -31,6 +31,52 @@ impl Add<Meters> for Millimeters {
     }
 }
 
+trait Pilot {
+    fn fly(&self);
+}
+
+trait Wizard {
+    fn fly(&self);
+}
+
+struct Human;
+
+impl Pilot for Human {
+    fn fly(&self) {
+        println!("This is your captain speaking.");
+    }
+}
+
+impl Wizard for Human {
+    fn fly(&self) {
+        println!("Up!");
+    }
+}
+
+impl Human {
+    fn fly(&self) {
+        println!("*waving arms furiously*");
+    }
+}
+
+trait Animal {
+    fn baby_name() -> String;
+}
+
+struct Dog;
+
+impl Dog {
+    fn baby_name() -> String {
+        String::from("Spot")
+    }
+}
+
+impl Animal for Dog {
+    fn baby_name() -> String {
+        String::from("puppy")
+    }
+}
+
 fn main() {
     assert_eq!(
             Point { x: 1, y: 0 } + Point { x: 2, y: 3 },
@@ -40,6 +86,12 @@ fn main() {
     assert_eq!(
         Millimeters(1001),
         Millimeters(1) + Meters(1)
-    )
-        
+    );
+    
+    let person = Human;
+    person.fly();
+    Pilot::fly(&person);
+    Wizard::fly(&person);
+    
+    println!("A baby dog is called a {}", <Dog as Animal>::baby_name());
 }