Update 3. Get Only What You Need, and Fast.md

Author: ortizfram

Introduction to MongoDB in Python/3. Get Only What You Need, and Fast.md

@@ -7,3 +7,9 @@
 ### 📚 simple aggregation 
 ![image](https://user-images.githubusercontent.com/51888893/204367355-6e6b185f-635c-4eee-839a-a8affb1d7759.png)
 
+## 🦍 Shares of the 1903 Prize in Physics
+You want to examine the laureates of the 1903 prize in physics and how they split the prize. Here is a query without projection:
+
+    db.laureates.find_one({"prizes": {"$elemMatch": {"category": "physics", "year": "1903"}}})
+  
+> Which projection(s) will fetch ***ONLY*** the laureates' full names and prize share info? I encourage you to experiment with the console and re-familiarize yourself with the structure of laureate collection documents.