diff --git a/DataStructures/README.md b/DataStructures/README.md
index b50de84..c1e5b00 100644
--- a/DataStructures/README.md
+++ b/DataStructures/README.md
@@ -7,7 +7,7 @@
 ## Resources
 
 *   [Syllabus](Syllabus.pdf)
-*   [Video Lectures on YouTube Channel.](http://www.youtube.com/course?list=ECoK2Lr1miEm-5zCzKE8siQezj9rvQlnca)
+*   [Video Lectures on YouTube Channel.](https://www.youtube.com/playlist?list=PLoK2Lr1miEm-5zCzKE8siQezj9rvQlnca)
 *   [Lecture Notes](LectureNotes). (Some equations may not be viewed correctly until you install some Mathematical fonts. You may install the trial version of [MathType](http://www.dessci.com/en/products/mathtype/) to get these fonts)
 *   [Code and Programs](Code).
 *   [Important texts](ImportantTexts.pdf) in C language, algorithms, and data structures.
diff --git a/Optimization/LectureNotes/Shots/white.png b/Optimization/LectureNotes/Shots/white.png
index a078837..076bd17 100644
Binary files a/Optimization/LectureNotes/Shots/white.png and b/Optimization/LectureNotes/Shots/white.png differ
diff --git a/Statistics/README.md b/Statistics/README.md
index 84cd568..cf2841b 100644
--- a/Statistics/README.md
+++ b/Statistics/README.md
@@ -7,7 +7,7 @@
 ## Resources
 
 *   [Course syllabus](CourseSyllabus.pdf).
-*   [Video Lectures.](http://www.youtube.com/course?list=EC3D4FE18BAD4F8AE1)
+*   [Video Lectures.](https://www.youtube.com/playlist?list=PL3D4FE18BAD4F8AE1)
 *   [Lecture Notes, solutions to selected problems, and some extra materials](LectureNotes).
 *   [Code and Programs](Code).