diff --git a/Big Countries b/Big Countries
new file mode 100644
index 0000000..af3aef6
--- /dev/null
+++ b/Big Countries	
@@ -0,0 +1,6 @@
+import pandas as pd
+
+def big_countries(world: pd.DataFrame) -> pd.DataFrame:
+    df = world[(world['area'] >= 3000000) | (world['population'] >= 25000000)]
+    return df[['name', 'population', 'area']]
+    
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diff --git a/Customer Who Never Order b/Customer Who Never Order
new file mode 100644
index 0000000..d0ec5b1
--- /dev/null
+++ b/Customer Who Never Order	
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+import pandas as pd
+
+def find_customers(customers: pd.DataFrame, orders: pd.DataFrame) -> pd.DataFrame:
+    df = customers.merge(orders, left_on = 'id', right_on = 'customerId', how = 'left')
+    df = df[df['customerId'].isna()]
+    return df[['name']].rename(columns={'name': 'Customers'})
+    
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diff --git a/Recyclable and Low Fat Products b/Recyclable and Low Fat Products
new file mode 100644
index 0000000..4e658fc
--- /dev/null
+++ b/Recyclable and Low Fat Products	
@@ -0,0 +1,5 @@
+import pandas as pd
+
+def find_products(products: pd.DataFrame) -> pd.DataFrame:
+    df = products[(products['low_fats'] == 'Y') & (products['recyclable'] == 'Y')]
+    return df[['product_id']]
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