diff --git a/Operating Systems b/Operating Systems
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+Useful articles:
+* [Robet love] (http://qr.ae/Rat5pe)
+Threads vs Processes 
diff --git a/README.md b/README.md
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@@ -21,6 +21,8 @@ For a very broad overview please go through these lectures, really useful:
 * [david malans cs75 scalability talk](https://www.youtube.com/watch?v=-W9F__D3oY4&list=PLmhRNZyYVpDmLpaVQm3mK5PY5KB_4hLjE&index=10)
 Feel free to go through other lectures if needed. 
 
+* [Bhavin(Directi)'s talk on scalability] (https://www.youtube.com/watch?v=yeyugGZO2qc&list=WL&index=7) 
+ This is another basic talk which gives good understanding on scalability aspects of building a website
 * [david huffman's talk , scaling up talk](https://www.udacity.com/course/web-development--cs253) ([Youtube link](https://www.youtube.com/watch?v=pjNTgULVVf4&list=PLVi1LmRuKQ0NINQfjKLVen7J2lZFL35wP&index=1))
 
 * [scalability for dummies](http://www.lecloud.net/tagged/scalability)