diff --git a/notebooks/birthdays.png b/notebooks/birthdays.png
index b78e3fe..56fc87c 100644
Binary files a/notebooks/birthdays.png and b/notebooks/birthdays.png differ
diff --git a/notebooks/crt-10-5.png b/notebooks/crt-10-5.png
index 35d3082..22477da 100644
Binary files a/notebooks/crt-10-5.png and b/notebooks/crt-10-5.png differ
diff --git a/notebooks/fermat.png b/notebooks/fermat.png
index 3e5699d..27ddb30 100644
Binary files a/notebooks/fermat.png and b/notebooks/fermat.png differ
diff --git a/notebooks/freq.png b/notebooks/freq.png
index 2a9a79e..29b2e42 100644
Binary files a/notebooks/freq.png and b/notebooks/freq.png differ
diff --git a/notebooks/freq_acute.png b/notebooks/freq_acute.png
index 8419075..e504812 100644
Binary files a/notebooks/freq_acute.png and b/notebooks/freq_acute.png differ
diff --git a/notebooks/galton.png b/notebooks/galton.png
index 987c3fd..844d46e 100644
Binary files a/notebooks/galton.png and b/notebooks/galton.png differ
diff --git a/notebooks/galton10-3000-2.png b/notebooks/galton10-3000-2.png
index eb739c3..8335b09 100644
Binary files a/notebooks/galton10-3000-2.png and b/notebooks/galton10-3000-2.png differ
diff --git a/notebooks/images/bookshelf1.png b/notebooks/images/bookshelf1.png
index ca4bc1b..9005fe7 100644
Binary files a/notebooks/images/bookshelf1.png and b/notebooks/images/bookshelf1.png differ
diff --git a/notebooks/images/bookshelf2.png b/notebooks/images/bookshelf2.png
index 26a5263..ab90e5e 100644
Binary files a/notebooks/images/bookshelf2.png and b/notebooks/images/bookshelf2.png differ
diff --git a/notebooks/images/bookshelf3.png b/notebooks/images/bookshelf3.png
index 3391309..b4ef0fb 100644
Binary files a/notebooks/images/bookshelf3.png and b/notebooks/images/bookshelf3.png differ
diff --git a/notebooks/images/dice.png b/notebooks/images/dice.png
index 1f5f081..eda8bdb 100644
Binary files a/notebooks/images/dice.png and b/notebooks/images/dice.png differ
diff --git a/notebooks/images/dice1.png b/notebooks/images/dice1.png
index 0212e26..d85149b 100644
Binary files a/notebooks/images/dice1.png and b/notebooks/images/dice1.png differ
diff --git a/notebooks/images/dice2.png b/notebooks/images/dice2.png
index eac41e0..c9c58bd 100644
Binary files a/notebooks/images/dice2.png and b/notebooks/images/dice2.png differ
diff --git a/notebooks/images/dice3.png b/notebooks/images/dice3.png
index 2bceddd..b843fb8 100644
Binary files a/notebooks/images/dice3.png and b/notebooks/images/dice3.png differ
diff --git a/notebooks/images/logo_combinatorics.png b/notebooks/images/logo_combinatorics.png
index 669ad47..d34bc9e 100644
Binary files a/notebooks/images/logo_combinatorics.png and b/notebooks/images/logo_combinatorics.png differ
diff --git a/notebooks/images/logo_delivery.png b/notebooks/images/logo_delivery.png
index 619e0f0..7744e5c 100644
Binary files a/notebooks/images/logo_delivery.png and b/notebooks/images/logo_delivery.png differ
diff --git a/notebooks/images/logo_graphs.png b/notebooks/images/logo_graphs.png
index ae93d5a..57ef705 100644
Binary files a/notebooks/images/logo_graphs.png and b/notebooks/images/logo_graphs.png differ
diff --git a/notebooks/images/logo_numbers.png b/notebooks/images/logo_numbers.png
index 6afbad5..d55a08f 100644
Binary files a/notebooks/images/logo_numbers.png and b/notebooks/images/logo_numbers.png differ
diff --git a/notebooks/images/logo_specialization.png b/notebooks/images/logo_specialization.png
index b18e093..ff32cb0 100644
Binary files a/notebooks/images/logo_specialization.png and b/notebooks/images/logo_specialization.png differ
diff --git a/notebooks/images/network.png b/notebooks/images/network.png
index d5862d3..99071da 100644
Binary files a/notebooks/images/network.png and b/notebooks/images/network.png differ
diff --git a/notebooks/images/plow_truck.png b/notebooks/images/plow_truck.png
index 0189606..2774b19 100644
Binary files a/notebooks/images/plow_truck.png and b/notebooks/images/plow_truck.png differ
diff --git a/notebooks/images/queens_permutations.png b/notebooks/images/queens_permutations.png
index d329505..e38002e 100644
Binary files a/notebooks/images/queens_permutations.png and b/notebooks/images/queens_permutations.png differ
diff --git a/notebooks/images/selection_schemes.png b/notebooks/images/selection_schemes.png
index be393fb..fc3e632 100644
Binary files a/notebooks/images/selection_schemes.png and b/notebooks/images/selection_schemes.png differ
diff --git a/notebooks/plow_truck_grid.png b/notebooks/plow_truck_grid.png
index 2e1d179..c75284e 100644
Binary files a/notebooks/plow_truck_grid.png and b/notebooks/plow_truck_grid.png differ
diff --git a/notebooks/stnetwork.png b/notebooks/stnetwork.png
index 35eb610..9a843e2 100644
Binary files a/notebooks/stnetwork.png and b/notebooks/stnetwork.png differ
diff --git a/notebooks/twourns.png b/notebooks/twourns.png
index 5901014..4e53b25 100644
Binary files a/notebooks/twourns.png and b/notebooks/twourns.png differ