diff --git a/pics/architecture/architecture_c4model_maps.jpg b/pics/architecture/architecture_c4model_maps.jpg
old mode 100755
new mode 100644
index 43c900a..041ced4
Binary files a/pics/architecture/architecture_c4model_maps.jpg and b/pics/architecture/architecture_c4model_maps.jpg differ
diff --git a/pics/architecture/architecture_c4model_scope.jpg b/pics/architecture/architecture_c4model_scope.jpg
old mode 100755
new mode 100644
index 35dc77f..b473496
Binary files a/pics/architecture/architecture_c4model_scope.jpg and b/pics/architecture/architecture_c4model_scope.jpg differ
diff --git a/pics/architecture/architecture_web_101.png b/pics/architecture/architecture_web_101.png
old mode 100755
new mode 100644
index 5134228..be284c3
Binary files a/pics/architecture/architecture_web_101.png and b/pics/architecture/architecture_web_101.png differ
diff --git a/pics/arduino_led.jpg b/pics/arduino_led.jpg
old mode 100755
new mode 100644
index 2742e15..8e83bea
Binary files a/pics/arduino_led.jpg and b/pics/arduino_led.jpg differ
diff --git a/pics/breadboard.png b/pics/breadboard.png
old mode 100755
new mode 100644
index f8b09a5..a588af8
Binary files a/pics/breadboard.png and b/pics/breadboard.png differ
diff --git a/pics/database/database_1nf.jpg b/pics/database/database_1nf.jpg
old mode 100755
new mode 100644
index 1ea96a3..f8931c5
Binary files a/pics/database/database_1nf.jpg and b/pics/database/database_1nf.jpg differ
diff --git a/pics/database/database_2nf.jpg b/pics/database/database_2nf.jpg
old mode 100755
new mode 100644
index b9cbe25..160bfd6
Binary files a/pics/database/database_2nf.jpg and b/pics/database/database_2nf.jpg differ
diff --git a/pics/database/database_3nf.jpg b/pics/database/database_3nf.jpg
old mode 100755
new mode 100644
index 29af794..b34a012
Binary files a/pics/database/database_3nf.jpg and b/pics/database/database_3nf.jpg differ
diff --git a/pics/database/database_denormalization.jpg b/pics/database/database_denormalization.jpg
old mode 100755
new mode 100644
index 5f54ba3..f3a8263
Binary files a/pics/database/database_denormalization.jpg and b/pics/database/database_denormalization.jpg differ
diff --git a/pics/database/database_many_to_many_1.jpg b/pics/database/database_many_to_many_1.jpg
old mode 100755
new mode 100644
index 9ae39d5..8de44ad
Binary files a/pics/database/database_many_to_many_1.jpg and b/pics/database/database_many_to_many_1.jpg differ
diff --git a/pics/database/database_many_to_many_2.jpg b/pics/database/database_many_to_many_2.jpg
old mode 100755
new mode 100644
index 2c6b585..51c5e0c
Binary files a/pics/database/database_many_to_many_2.jpg and b/pics/database/database_many_to_many_2.jpg differ
diff --git a/pics/database/database_normalization.jpg b/pics/database/database_normalization.jpg
old mode 100755
new mode 100644
index ef41da3..fa6aa95
Binary files a/pics/database/database_normalization.jpg and b/pics/database/database_normalization.jpg differ
diff --git a/pics/database/database_one_to_many_1.jpg b/pics/database/database_one_to_many_1.jpg
old mode 100755
new mode 100644
index b80aa00..60bd7bc
Binary files a/pics/database/database_one_to_many_1.jpg and b/pics/database/database_one_to_many_1.jpg differ
diff --git a/pics/database/database_one_to_many_2.jpg b/pics/database/database_one_to_many_2.jpg
old mode 100755
new mode 100644
index 9ba8294..187d4fd
Binary files a/pics/database/database_one_to_many_2.jpg and b/pics/database/database_one_to_many_2.jpg differ
diff --git a/pics/database/database_one_to_one_1.jpg b/pics/database/database_one_to_one_1.jpg
old mode 100755
new mode 100644
index 6a4a0cf..74f943d
Binary files a/pics/database/database_one_to_one_1.jpg and b/pics/database/database_one_to_one_1.jpg differ
diff --git a/pics/database/database_one_to_one_2.jpg b/pics/database/database_one_to_one_2.jpg
old mode 100755
new mode 100644
index cf23592..cc120ff
Binary files a/pics/database/database_one_to_one_2.jpg and b/pics/database/database_one_to_one_2.jpg differ
diff --git a/pics/electronics/khan_current.jpg b/pics/electronics/khan_current.jpg
old mode 100755
new mode 100644
index d29d668..f20f370
Binary files a/pics/electronics/khan_current.jpg and b/pics/electronics/khan_current.jpg differ
diff --git a/pics/electronics/khan_voltage.jpg b/pics/electronics/khan_voltage.jpg
old mode 100755
new mode 100644
index a88b726..ced6a77
Binary files a/pics/electronics/khan_voltage.jpg and b/pics/electronics/khan_voltage.jpg differ
diff --git a/pics/elm/TEA.png b/pics/elm/TEA.png
old mode 100755
new mode 100644
index b1bfc80..f1ae482
Binary files a/pics/elm/TEA.png and b/pics/elm/TEA.png differ
diff --git a/pics/elm/elm_arch.png b/pics/elm/elm_arch.png
old mode 100755
new mode 100644
index 991389d..3ec48b7
Binary files a/pics/elm/elm_arch.png and b/pics/elm/elm_arch.png differ
diff --git a/pics/express/express_middleware.jpg b/pics/express/express_middleware.jpg
old mode 100755
new mode 100644
index 51c5cbf..49fb5cf
Binary files a/pics/express/express_middleware.jpg and b/pics/express/express_middleware.jpg differ
diff --git a/pics/git/git_workflow.jpg b/pics/git/git_workflow.jpg
old mode 100755
new mode 100644
index 895f0ad..5f96274
Binary files a/pics/git/git_workflow.jpg and b/pics/git/git_workflow.jpg differ
diff --git a/pics/grid.jpg b/pics/grid.jpg
old mode 100755
new mode 100644
index 3803bb8..133219a
Binary files a/pics/grid.jpg and b/pics/grid.jpg differ
diff --git a/pics/inherit.jpg b/pics/inherit.jpg
old mode 100755
new mode 100644
index 9a8f616..2b2bf4b
Binary files a/pics/inherit.jpg and b/pics/inherit.jpg differ
diff --git a/pics/js_event_loop.png b/pics/js_event_loop.png
old mode 100755
new mode 100644
index 3f0e292..aa68ece
Binary files a/pics/js_event_loop.png and b/pics/js_event_loop.png differ
diff --git a/pics/mvc_full_stack.jpg b/pics/mvc_full_stack.jpg
old mode 100755
new mode 100644
index 4ed45bb..6252124
Binary files a/pics/mvc_full_stack.jpg and b/pics/mvc_full_stack.jpg differ
diff --git a/pics/networking/OSI.png b/pics/networking/OSI.png
old mode 100755
new mode 100644
index d1bfb7c..a75b719
Binary files a/pics/networking/OSI.png and b/pics/networking/OSI.png differ
diff --git a/pics/networking/OSI_vs_TCPIP.jpg b/pics/networking/OSI_vs_TCPIP.jpg
old mode 100755
new mode 100644
index 36562a5..30af1d0
Binary files a/pics/networking/OSI_vs_TCPIP.jpg and b/pics/networking/OSI_vs_TCPIP.jpg differ
diff --git a/pics/networking/TCPIP.jpg b/pics/networking/TCPIP.jpg
old mode 100755
new mode 100644
index d2a64b9..3f78c8b
Binary files a/pics/networking/TCPIP.jpg and b/pics/networking/TCPIP.jpg differ
diff --git a/pics/networking/data_flow.jpg b/pics/networking/data_flow.jpg
old mode 100755
new mode 100644
index 4359bcd..f2d53a9
Binary files a/pics/networking/data_flow.jpg and b/pics/networking/data_flow.jpg differ
diff --git a/pics/networking/http.jpg b/pics/networking/http.jpg
old mode 100755
new mode 100644
index 8d7531a..acbd1a1
Binary files a/pics/networking/http.jpg and b/pics/networking/http.jpg differ
diff --git a/pics/networking/ping.jpg b/pics/networking/ping.jpg
old mode 100755
new mode 100644
index 3d5bc2b..61ea73d
Binary files a/pics/networking/ping.jpg and b/pics/networking/ping.jpg differ
diff --git a/pics/rfid_wiegand_arduino.jpg b/pics/rfid_wiegand_arduino.jpg
old mode 100755
new mode 100644
index 5fbf601..c7c9dfc
Binary files a/pics/rfid_wiegand_arduino.jpg and b/pics/rfid_wiegand_arduino.jpg differ
diff --git a/pics/sql/pivot_unpivot.png b/pics/sql/pivot_unpivot.png
old mode 100755
new mode 100644
index edcb81e..b92b114
Binary files a/pics/sql/pivot_unpivot.png and b/pics/sql/pivot_unpivot.png differ
diff --git a/pics/startup/market_fit/market_fit_startup_stages.jpg b/pics/startup/market_fit/market_fit_startup_stages.jpg
old mode 100755
new mode 100644
index b1cb5bd..77c7a4a
Binary files a/pics/startup/market_fit/market_fit_startup_stages.jpg and b/pics/startup/market_fit/market_fit_startup_stages.jpg differ
diff --git a/pics/startup/mvp/mvp.jpg b/pics/startup/mvp/mvp.jpg
old mode 100755
new mode 100644
index e608245..1f68917
Binary files a/pics/startup/mvp/mvp.jpg and b/pics/startup/mvp/mvp.jpg differ
diff --git a/pics/startup/mvp/mvp_airbnb.jpg b/pics/startup/mvp/mvp_airbnb.jpg
old mode 100755
new mode 100644
index dbc0a1e..8090ed6
Binary files a/pics/startup/mvp/mvp_airbnb.jpg and b/pics/startup/mvp/mvp_airbnb.jpg differ
diff --git a/pics/startup/mvp/mvp_stripe.jpg b/pics/startup/mvp/mvp_stripe.jpg
old mode 100755
new mode 100644
index 7029744..f4700bb
Binary files a/pics/startup/mvp/mvp_stripe.jpg and b/pics/startup/mvp/mvp_stripe.jpg differ
diff --git a/pics/startup/mvp/mvp_twitch.jpg b/pics/startup/mvp/mvp_twitch.jpg
old mode 100755
new mode 100644
index bdc108a..223ebf2
Binary files a/pics/startup/mvp/mvp_twitch.jpg and b/pics/startup/mvp/mvp_twitch.jpg differ
diff --git a/pics/startup/pricing/pricing_billion_formula.jpg b/pics/startup/pricing/pricing_billion_formula.jpg
old mode 100755
new mode 100644
index 761b5b5..29e0053
Binary files a/pics/startup/pricing/pricing_billion_formula.jpg and b/pics/startup/pricing/pricing_billion_formula.jpg differ
diff --git a/pics/startup/pricing/pricing_optimization.jpg b/pics/startup/pricing/pricing_optimization.jpg
old mode 100755
new mode 100644
index acfa5b6..f276de4
Binary files a/pics/startup/pricing/pricing_optimization.jpg and b/pics/startup/pricing/pricing_optimization.jpg differ
diff --git a/pics/startup/pricing/pricing_quadrants.jpg b/pics/startup/pricing/pricing_quadrants.jpg
old mode 100755
new mode 100644
index 33f2875..84a02dd
Binary files a/pics/startup/pricing/pricing_quadrants.jpg and b/pics/startup/pricing/pricing_quadrants.jpg differ
diff --git a/pics/startup/pricing/pricing_rule.jpg b/pics/startup/pricing/pricing_rule.jpg
old mode 100755
new mode 100644
index 339de64..e6275ab
Binary files a/pics/startup/pricing/pricing_rule.jpg and b/pics/startup/pricing/pricing_rule.jpg differ
diff --git a/pics/startup/pricing/pricing_sales_stages.jpg b/pics/startup/pricing/pricing_sales_stages.jpg
old mode 100755
new mode 100644
index b7264fb..0bb194e
Binary files a/pics/startup/pricing/pricing_sales_stages.jpg and b/pics/startup/pricing/pricing_sales_stages.jpg differ
diff --git a/pics/startup/pricing/pricing_thermometer.jpg b/pics/startup/pricing/pricing_thermometer.jpg
old mode 100755
new mode 100644
index 2861548..f25e23b
Binary files a/pics/startup/pricing/pricing_thermometer.jpg and b/pics/startup/pricing/pricing_thermometer.jpg differ
diff --git a/pics/startup/product_design/object_model.jpg b/pics/startup/product_design/object_model.jpg
old mode 100755
new mode 100644
index 458aee1..8459301
Binary files a/pics/startup/product_design/object_model.jpg and b/pics/startup/product_design/object_model.jpg differ
diff --git a/pics/startup/product_design/responsibilities.jpg b/pics/startup/product_design/responsibilities.jpg
old mode 100755
new mode 100644
index 783ee02..a38e52c
Binary files a/pics/startup/product_design/responsibilities.jpg and b/pics/startup/product_design/responsibilities.jpg differ
diff --git a/pics/startup/sales/sales_conversations_phone.jpg b/pics/startup/sales/sales_conversations_phone.jpg
old mode 100755
new mode 100644
index 37c8924..653323c
Binary files a/pics/startup/sales/sales_conversations_phone.jpg and b/pics/startup/sales/sales_conversations_phone.jpg differ
diff --git a/pics/startup/sales/sales_cycle.jpg b/pics/startup/sales/sales_cycle.jpg
old mode 100755
new mode 100644
index c81a086..0c5cdce
Binary files a/pics/startup/sales/sales_cycle.jpg and b/pics/startup/sales/sales_cycle.jpg differ
diff --git a/pics/startup/sales/sales_expectations.jpg b/pics/startup/sales/sales_expectations.jpg
old mode 100755
new mode 100644
index ca8a5cc..65a5a8d
Binary files a/pics/startup/sales/sales_expectations.jpg and b/pics/startup/sales/sales_expectations.jpg differ
diff --git a/pics/startup/sales/sales_follow_up.jpg b/pics/startup/sales/sales_follow_up.jpg
old mode 100755
new mode 100644
index 5bde180..0fd9ac6
Binary files a/pics/startup/sales/sales_follow_up.jpg and b/pics/startup/sales/sales_follow_up.jpg differ
diff --git a/pics/startup/sales/sales_reality.jpg b/pics/startup/sales/sales_reality.jpg
old mode 100755
new mode 100644
index c15d525..3a6e216
Binary files a/pics/startup/sales/sales_reality.jpg and b/pics/startup/sales/sales_reality.jpg differ