diff --git a/labs/lab_1/lab_1a.py b/labs/lab_1/lab_1a.py
index 9d15ec83..407746c4 100644
--- a/labs/lab_1/lab_1a.py
+++ b/labs/lab_1/lab_1a.py
@@ -3,6 +3,7 @@
 
 The first lab in the BWSI CSS course. To complete this lab, fill out the variable on line 10
 with your name. Then, save the code, add it to the staging area, and commit it to the Git tree.
+This is to simulate a change made on a robot: robot_speed = 5 # m/s
 """
 
 def main():
diff --git a/labs/lab_1/lab_1b.py b/labs/lab_1/lab_1b.py
index e58dd957..7b902fe7 100644
--- a/labs/lab_1/lab_1b.py
+++ b/labs/lab_1/lab_1b.py
@@ -37,13 +37,20 @@ def simple_calculator(operation: str, num1: float, num2: float) -> float:
     else:
         raise ValueError("Invalid operation. Please choose from 'add', 'subtract', 'multiply', or 'divide'.")
 
+def request_sanitized_number(prompt: str) -> float:
+    while True:
+        try:
+            number = float(input(prompt))
+            return number
+        except ValueError:
+            print("Invalid input. Please enter a valid number.")
 def main():
     
     print(f"===== Simple Calculator =====")
 
-    # Ask the user for sample input    
-    num1 = float(input("Enter the first number: "))
-    num2 = float(input("Enter the second number: "))
+    # Ask the user for input and ensure both numbers are valid floats.
+    num1 = request_sanitized_number("Enter the first number: ")
+    num2 = request_sanitized_number("Enter the second number: ")
     operation = input("Enter the operation (add, subtract, multiply, divide): ").strip().lower()
 
     # Perform the calculation and display the result