diff --git a/images/arrays_nltk.png b/images/arrays_nltk.png
index e0c172a4..eaec919d 100644
Binary files a/images/arrays_nltk.png and b/images/arrays_nltk.png differ
diff --git a/images/binary_tree_wikipedia.png b/images/binary_tree_wikipedia.png
index c6a88744..70cf1554 100644
Binary files a/images/binary_tree_wikipedia.png and b/images/binary_tree_wikipedia.png differ
diff --git a/images/bit_manipulation_wikipedia.png b/images/bit_manipulation_wikipedia.png
index 70fcfe61..6b2c97c2 100644
Binary files a/images/bit_manipulation_wikipedia.png and b/images/bit_manipulation_wikipedia.png differ
diff --git a/images/cover_challenge.gif b/images/cover_challenge.gif
index 6aa75ae3..e8329b26 100644
Binary files a/images/cover_challenge.gif and b/images/cover_challenge.gif differ
diff --git a/images/cover_solution.gif b/images/cover_solution.gif
index 209944da..3323d037 100644
Binary files a/images/cover_solution.gif and b/images/cover_solution.gif differ
diff --git a/images/dijkstra.gif b/images/dijkstra.gif
index 3b1a2ef4..836b92a2 100644
Binary files a/images/dijkstra.gif and b/images/dijkstra.gif differ
diff --git a/images/fibonacci_wikipedia.png b/images/fibonacci_wikipedia.png
index cd8c23db..66399c7e 100644
Binary files a/images/fibonacci_wikipedia.png and b/images/fibonacci_wikipedia.png differ
diff --git a/images/graphs.png b/images/graphs.png
index 782c8f21..f68626cd 100644
Binary files a/images/graphs.png and b/images/graphs.png differ
diff --git a/images/insertion_sort.gif b/images/insertion_sort.gif
index 96c1b12d..e1349e2d 100644
Binary files a/images/insertion_sort.gif and b/images/insertion_sort.gif differ
diff --git a/images/logo_topcoder.png b/images/logo_topcoder.png
index 97329105..a385b701 100644
Binary files a/images/logo_topcoder.png and b/images/logo_topcoder.png differ
diff --git a/images/merge_sort.gif b/images/merge_sort.gif
index daa0c86b..1c3d4262 100644
Binary files a/images/merge_sort.gif and b/images/merge_sort.gif differ
diff --git a/images/probability_distribution_wikipedia.png b/images/probability_distribution_wikipedia.png
index d14b2a5a..46449b3a 100644
Binary files a/images/probability_distribution_wikipedia.png and b/images/probability_distribution_wikipedia.png differ
diff --git a/images/selection_sort.gif b/images/selection_sort.gif
index b441c4eb..3c66d84c 100644
Binary files a/images/selection_sort.gif and b/images/selection_sort.gif differ
diff --git a/images/sieve.gif b/images/sieve.gif
index cd385eec..5581b4e7 100644
Binary files a/images/sieve.gif and b/images/sieve.gif differ
diff --git a/images/stack_queue_wikipedia.png b/images/stack_queue_wikipedia.png
index a6b2dd5d..deb8373c 100644
Binary files a/images/stack_queue_wikipedia.png and b/images/stack_queue_wikipedia.png differ