diff --git a/1-getting-started/lessons/3-sensors-and-actuators/README.md b/1-getting-started/lessons/3-sensors-and-actuators/README.md
index 9f7a161..5ca8d15 100644
--- a/1-getting-started/lessons/3-sensors-and-actuators/README.md
+++ b/1-getting-started/lessons/3-sensors-and-actuators/README.md
@@ -207,7 +207,7 @@ For every device you listed, what sensors and actuators are they connected to? W
 
 ## Review & Self Study
 
-* Read up on electricity and circuits on [ThingLearn](http://www.thinglearn.com/essentials/).
+* Read up on electricity and circuits on [ThingLearn](http://thinglearn.jenlooper.com/curriculum/).
 * Read about the different types of temperature sensors on the [Seeed Studios Temperature Sensors guide](https://www.seeedstudio.com/blog/2019/10/14/temperature-sensors-for-arduino-projects/)
 * Read about LEDs on the [Wikipedia LED page](https://wikipedia.org/wiki/Light-emitting_diode)
 
diff --git a/1-getting-started/lessons/3-sensors-and-actuators/translations/README.ar.md b/1-getting-started/lessons/3-sensors-and-actuators/translations/README.ar.md
index 0f17d39..2c03f2e 100644
--- a/1-getting-started/lessons/3-sensors-and-actuators/translations/README.ar.md
+++ b/1-getting-started/lessons/3-sensors-and-actuators/translations/README.ar.md
@@ -199,7 +199,7 @@
 
 ## مراجعة ودراسة ذاتية
 
-* اقرأ عن الكهرباء والدوائر على <a href="http://www.thinglearn.com/essentials/">ThingLearn</a>.
+* اقرأ عن الكهرباء والدوائر على <a href="http://thinglearn.jenlooper.com/curriculum/">ThingLearn</a>.
 * اقرأ عن الأنواع المختلفة من مستشعرات درجة الحرارة في <a href="https://www.seeedstudio.com/blog/2019/10/14/temperature-sensors-for-arduino-projects/">دليل مستشعرات درجة الحرارة في الاستوديوها</a> 
 * اقرأ عن مصابيح LED على <a href="https://wikipedia.org/wiki/Light-emitting_diode">صفحة Wikipedia LED</a> 
 
diff --git a/1-getting-started/lessons/3-sensors-and-actuators/translations/README.bn.md b/1-getting-started/lessons/3-sensors-and-actuators/translations/README.bn.md
index af95115..4e8700a 100644
--- a/1-getting-started/lessons/3-sensors-and-actuators/translations/README.bn.md
+++ b/1-getting-started/lessons/3-sensors-and-actuators/translations/README.bn.md
@@ -194,7 +194,7 @@
 
 ## রিভিউ এবং স্ব-অধ্যয়ন
 
-* [ThingLearn](http://www.thinglearn.com/essentials/) থেকে ইলেক্ট্রিসিটি ও সার্কিটের ব্যাপারে পড়া।
+* [ThingLearn](http://thinglearn.jenlooper.com/curriculum/) থেকে ইলেক্ট্রিসিটি ও সার্কিটের ব্যাপারে পড়া।
 * [Seeed Studios Temperature Sensors guide](https://www.seeedstudio.com/blog/2019/10/14/temperature-sensors-for-arduino-projects/) থেকে বিভিন্ন ধরণের তাপমাত্রা সেন্সরের ব্যাপারে জানা।
 * এলইডি সম্পর্কে [Wikipedia LED page](https://wikipedia.org/wiki/Light-emitting_diode) থেকে আরো বিস্তারিত ধারণা লাভ করা।