diff --git a/README.md b/README.md
index e963b99..e15e293 100644
--- a/README.md
+++ b/README.md
@@ -192,7 +192,25 @@ An updated and curated list of selected readings to illustrate High Scalability,
 		* [Using S3 in Netflix Chukwa](https://medium.com/netflix-techblog/evolution-of-the-netflix-data-pipeline-da246ca36905)	
 		* [Yahoo Cloud Object Store - Object Storage at Exabyte Scale](https://yahooeng.tumblr.com/post/116391291701/yahoo-cloud-object-store-object-storage-at)
 		* [Ambry: Distributed Immutable Object Store at LinkedIn](https://www.usenix.org/conference/srecon17americas/program/presentation/shenoy)
-		* [Hammerspace: Persistent, Concurrent, Off-heap Storage at Airbnb](https://medium.com/airbnb-engineering/hammerspace-persistent-concurrent-off-heap-storage-3db39bb04472)		
+		* [Hammerspace: Persistent, Concurrent, Off-heap Storage at Airbnb](https://medium.com/airbnb-engineering/hammerspace-persistent-concurrent-off-heap-storage-3db39bb04472)	
+* [Relational Databases (MySQL, MSSQL, PostgreSQL)](https://www.mysql.com/products/cluster/scalability.html)
+	* [Microsoft SQL versus MySQL](https://www.upwork.com/hiring/data/sql-vs-mysql-which-relational-database-is-right-for-you/)
+	* [SQL Database Performance Tuning](https://www.toptal.com/sql-server/sql-database-tuning-for-developers)
+	* [Scaling PostgreSQL Using CUDA](http://highscalability.com/blog/2009/5/28/scaling-postgresql-using-cuda.html)
+	* [Scaling Distributed Joins](http://blog.memsql.com/scaling-distributed-joins/)
+	* [MySQL System Design at Booking.com](https://www.percona.com/live/mysql-conference-2015/sessions/bookingcom-evolution-mysql-system-design)
+	* [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)
+	* [Partitioning Main MySQL Database at Airbnb](https://medium.com/airbnb-engineering/how-we-partitioned-airbnb-s-main-database-in-two-weeks-55f7e006ff21)
+	* [PostgreSQL at Twitch](https://blog.twitch.tv/how-twitch-uses-postgresql-c34aa9e56f58)
+	* [Scaling MySQL-based Financial Reporting System at Airbnb](https://medium.com/airbnb-engineering/tracking-the-money-scaling-financial-reporting-at-airbnb-6d742b80f040)
+	* [Scaling MySQL at Wix](https://www.wix.engineering/single-post/scaling-to-100m-mysql-is-a-better-nosql)
+	* [Switching from Postgres to MySQL at Uber](https://eng.uber.com/mysql-migration/)
+	* [Handling Growth with Postgres at Instagram](https://engineering.instagram.com/handling-growth-with-postgres-5-tips-from-instagram-d5d7e7ffdfcb)
+	* [Scaling the Analytics Database (Postgres) at TransferWise](http://tech.transferwise.com/scaling-our-analytics-database/)
+	* [Sharding (Horizontal Partitioning)](https://www.educative.io/collection/page/5668639101419520/5649050225344512/5146118144917504)
+		* [Sharding MySQL at Pinterest](https://medium.com/@Pinterest_Engineering/sharding-pinterest-how-we-scaled-our-mysql-fleet-3f341e96ca6f)
+		* [Sharding MySQL at MailChimp](https://devs.mailchimp.com/blog/using-shards-to-accommodate-millions-of-users/)
+		* [Sharding MySQL (3 parts) at Evernote](https://blog.evernote.com/tech/2015/10/08/the-great-shard-migration-part-ii/)			
 * [NoSQL Databases](https://www.thoughtworks.com/insights/blog/nosql-databases-overview)
 	* [Key-Value Databases (DynamoDB, Voldemort, Manhattan)](http://highscalability.com/anti-rdbms-list-distributed-key-value-stores)
 		* [Scaling Mapbox infrastructure with DynamoDB Streams](https://blog.mapbox.com/scaling-mapbox-infrastructure-with-dynamodb-streams-d53eabc5e972)
@@ -238,25 +256,8 @@ An updated and curated list of selected readings to illustrate High Scalability,
 		* [Learn Redis the hard way (in production) at Trivago](http://tech.trivago.com/2017/01/25/learn-redis-the-hard-way-in-production/)
 		* [Optimizing Session Key Storage in Redis at Deliveroo](https://deliveroo.engineering/2016/10/07/optimising-session-key-storage.html)
 		* [Optimizing Redis Storage at Deliveroo](https://deliveroo.engineering/2017/01/19/optimising-membership-queries.html)		
-* [Relational Databases (MySQL, MSSQL, PostgreSQL)](https://www.mysql.com/products/cluster/scalability.html)
-	* [Microsoft SQL versus MySQL](https://www.upwork.com/hiring/data/sql-vs-mysql-which-relational-database-is-right-for-you/)
-	* [SQL Database Performance Tuning](https://www.toptal.com/sql-server/sql-database-tuning-for-developers)
-	* [Scaling PostgreSQL Using CUDA](http://highscalability.com/blog/2009/5/28/scaling-postgresql-using-cuda.html)
-	* [Scaling Distributed Joins](http://blog.memsql.com/scaling-distributed-joins/)
-	* [MySQL System Design at Booking.com](https://www.percona.com/live/mysql-conference-2015/sessions/bookingcom-evolution-mysql-system-design)
-	* [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)
-	* [Partitioning Main MySQL Database at Airbnb](https://medium.com/airbnb-engineering/how-we-partitioned-airbnb-s-main-database-in-two-weeks-55f7e006ff21)
-	* [PostgreSQL at Twitch](https://blog.twitch.tv/how-twitch-uses-postgresql-c34aa9e56f58)
-	* [Scaling MySQL-based Financial Reporting System at Airbnb](https://medium.com/airbnb-engineering/tracking-the-money-scaling-financial-reporting-at-airbnb-6d742b80f040)
-	* [Scaling MySQL at Wix](https://www.wix.engineering/single-post/scaling-to-100m-mysql-is-a-better-nosql)
-	* [Switching from Postgres to MySQL at Uber](https://eng.uber.com/mysql-migration/)
-	* [Handling Growth with Postgres at Instagram](https://engineering.instagram.com/handling-growth-with-postgres-5-tips-from-instagram-d5d7e7ffdfcb)
-	* [Scaling the Analytics Database (Postgres) at TransferWise](http://tech.transferwise.com/scaling-our-analytics-database/)
-	* [Sharding (Horizontal Partitioning)](https://www.educative.io/collection/page/5668639101419520/5649050225344512/5146118144917504)
-		* [Sharding MySQL at Pinterest](https://medium.com/@Pinterest_Engineering/sharding-pinterest-how-we-scaled-our-mysql-fleet-3f341e96ca6f)
-		* [Sharding MySQL at MailChimp](https://devs.mailchimp.com/blog/using-shards-to-accommodate-millions-of-users/)
-		* [Sharding MySQL (3 parts) at Evernote](https://blog.evernote.com/tech/2015/10/08/the-great-shard-migration-part-ii/)
 * [Time Series Database (TSDB)](https://www.influxdata.com/time-series-database/)
+	* [What is Time-Series Data & Why We Need a Time-Series Database](https://blog.timescale.com/what-the-heck-is-time-series-data-and-why-do-i-need-a-time-series-database-dcf3b1b18563)
 	* [Time Series Data: Why and How to Use a Relational Database instead of NoSQL](https://blog.timescale.com/time-series-data-why-and-how-to-use-a-relational-database-instead-of-nosql-d0cd6975e87c)
 	* [Beringei: High-performance Time Series Storage Engine at Facebook](https://code.facebook.com/posts/952820474848503/beringei-a-high-performance-time-series-storage-engine/)	
 	* [Atlas: In-memory Dimensional Time Series Database at Netflix](https://medium.com/netflix-techblog/introducing-atlas-netflixs-primary-telemetry-platform-bd31f4d8ed9a)