diff --git a/README.md b/README.md
index 2d650be..f8df5ca 100644
--- a/README.md
+++ b/README.md
@@ -130,7 +130,7 @@ An updated and organized reading list for illustrating the patterns of scalable,
 	* [Analysis of Photo Caching at Facebook](https://code.facebook.com/posts/220956754772273/an-analysis-of-facebook-photo-caching/)
 	* [Cache Efficiency Exercise at Facebook](https://code.facebook.com/posts/964122680272229/web-performance-cache-efficiency-exercise/)
 	* [tCache: Scalable Data-aware Java Caching at Trivago](http://tech.trivago.com/2015/10/15/tcache/)
-	* [Pycache: In-process Caching at Quora](https://quoraquoraengineering.quora.com/Pycache-lightning-fast-in-process-caching)	
+	* [Pycache: In-process Caching at Quora](https://quoraengineering.quora.com/Pycache-lightning-fast-in-process-caching)
 	* [Reduce Memcached Memory Usage by 50% at Trivago](http://tech.trivago.com/2017/12/19/how-trivago-reduced-memcached-memory-usage-by-50/)
 	* [Caching Internal Service Calls at Yelp](https://engineeringblog.yelp.com/2018/03/caching-internal-service-calls-at-yelp.html)
 	* [Estimating the Cache Efficiency using Big Data at Allegro](https://allegro.tech/2017/01/estimating-the-cache-efficiency-using-big-data.html)
@@ -395,7 +395,7 @@ An updated and organized reading list for illustrating the patterns of scalable,
 	* [Scaling Database Access for 100s of Billions of Queries per Day at PayPal](https://medium.com/paypal-engineering/scaling-database-access-for-100s-of-billions-of-queries-per-day-paypal-introducing-hera-e192adacda54)
 	* [Minimizing Read-Write MySQL Downtime at Yelp](https://engineeringblog.yelp.com/2020/11/minimizing-read-write-mysql-downtime.html)
 	* [Migrating MySQL from 5.6 to 8.0 at Facebook](https://engineering.fb.com/2021/07/22/data-infrastructure/mysql/)
-	* [Migration from HBase to MyRocks at Quora](https://quoraquoraengineering.quora.com/Migration-from-HBase-to-MyRocks-at-Quora)
+	* [Migration from HBase to MyRocks at Quora](https://quoraengineering.quora.com/Migration-from-HBase-to-MyRocks-at-Quora)
 	* [Replication](https://docs.microsoft.com/en-us/sql/relational-databases/replication/types-of-replication)
 		* [MySQL Parallel Replication (4 parts) at Booking.com](https://medium.com/booking-com-infrastructure/evaluating-mysql-parallel-replication-part-4-annex-under-the-hood-eb456cf8b2fb)
 		* [Mitigating MySQL Replication Lag and Reducing Read Load at Github](https://githubengineering.com/mitigating-replication-lag-and-reducing-read-load-with-freno/)
@@ -785,7 +785,7 @@ An updated and organized reading list for illustrating the patterns of scalable,
 	* [Quantile Regression for Delivering On Time at Instacart](https://tech.instacart.com/how-instacart-delivers-on-time-using-quantile-regression-2383e2e03edb)
 	* [Cross-Lingual End-to-End Product Search with Deep Learning at Zalando](https://engineering.zalando.com/posts/2018/02/search-deep-neural-network.html)
 	* [Machine Learning at Jane Street](https://blog.janestreet.com/real-world-machine-learning-part-1/)
-	* [Machine Learning for Ranking Answers End-to-End at Quora](https://quoraquoraengineering.quora.com/A-Machine-Learning-Approach-to-Ranking-Answers-on-Quora)
+	* [Machine Learning for Ranking Answers End-to-End at Quora](https://quoraengineering.quora.com/A-Machine-Learning-Approach-to-Ranking-Answers-on-Quora)
 	* [Ranking Platform at Booking.com](https://medium.com/booking-com-development/the-engineering-behind-booking-coms-ranking-platform-a-system-overview-2fb222003ca6)
 	* [Clustering Similar Stories Using LDA at Flipboard](http://engineering.flipboard.com/2017/02/storyclustering)
 	* [Similarity Search at Flickr](https://code.flickr.net/2017/03/07/introducing-similarity-search-at-flickr/)