diff --git a/src/pp.01.01-Inheritance/src/main/java/pp/Sensor.java b/src/pp.01.01-Inheritance/src/main/java/pp/Sensor.java
index bca5e97..43951b4 100644
--- a/src/pp.01.01-Inheritance/src/main/java/pp/Sensor.java
+++ b/src/pp.01.01-Inheritance/src/main/java/pp/Sensor.java
@@ -37,5 +37,6 @@ public class Sensor extends Thread {
 
     public static void main(String... args) {
         var s = new Sensor(1000);
+        s.start();
     }
 }
diff --git a/src/pp.01.01-Inheritance/src/main/java/pp/Thermometer.java b/src/pp.01.01-Inheritance/src/main/java/pp/Thermometer.java
index b823af0..76042c9 100644
--- a/src/pp.01.01-Inheritance/src/main/java/pp/Thermometer.java
+++ b/src/pp.01.01-Inheritance/src/main/java/pp/Thermometer.java
@@ -18,6 +18,8 @@ public class Thermometer extends Sensor {
 
     public static void main(String... args) {
         var s1 = new Thermometer(1000);
+        s1.start();
         var s2 = new Thermometer(3000);
+        s2.start();
     }
 }