diff --git a/04_Day_Strings/day_4.py b/04_Day_Strings/day_4.py
index 54e59464b..2562ffea1 100644
--- a/04_Day_Strings/day_4.py
+++ b/04_Day_Strings/day_4.py
@@ -129,7 +129,7 @@
 
 radius = 10
 pi = 3.14
-area = pi  # radius ## 2
+area = pi * radius ** 2
 result = 'The area of circle with {} is {}'.format(str(radius), str(area))
 print(result)  # The area of circle with 10 is 314.0
 
diff --git a/05_Day_Lists/day_5.py b/05_Day_Lists/day_5.py
index 6b9c2a1f7..cdf4c438f 100644
--- a/05_Day_Lists/day_5.py
+++ b/05_Day_Lists/day_5.py
@@ -8,7 +8,7 @@
 animal_products = ['milk', 'meat', 'butter',
                    'yoghurt']             # list of animal products
 web_techs = ['HTML', 'CSS', 'JS', 'React', 'Redux',
-             'Node', 'MongDB']  # list of web technologies
+             'Node', 'MongoDB']  # list of web technologies
 countries = ['Finland', 'Estonia', 'Denmark', 'Sweden', 'Norway']
 
 # Print the lists and it length
@@ -164,13 +164,14 @@
 print(fruits.index('orange'))   # 1
 ages = [22, 19, 24, 25, 26, 24, 25, 24]
 print(ages.index(24))
+
 # Reverse
 fruits = ['banana', 'orange', 'mango', 'lemon']
 fruits.reverse()
-print(fruits.reverse())
+print(fruits)
 ages = [22, 19, 24, 25, 26, 24, 25, 24]
 ages.reverse()
-print(ages.reverse())
+print(ages)
 
 # sort
 fruits = ['banana', 'orange', 'mango', 'lemon']