1.1 Title image: Photo by Kane Reinholdtsen on Unsplash

1.1.2 Sponge image: Photo by Volodymyr Hryshchenko on Unsplash

1.2 Title image: Photo by Miguel Heriques on Unsplash

1.2.1 Aristotle image: Public domain via Wikipedia

1.2.1 Ruins image: Photo by ESR LAW on Unsplash

1.2.1 Collesseum image: Photo by Yoal Desurmont on Unsplash

1.2.2 Protest image: Photo by Alex Radelich on Unsplash

1.2.2 "Fake News" image: Photo by Kayla Velasquez on Unsplash

1.2.3 Science image: Photo by Moritz Kindler on Unsplash

1.2.4 "Reviewing" image: Photo by Helloquence on Unsplash

1.2.4 Crowd clapping image: Photo by Hayley Catherine on Unsplash

1.3 Title image: Photo by Tachina Lee on Unsplash

1.3.2 Split path image: Photo by Vladislav Babienko on Unsplash

1.3.4 Brain image: Photo by Jesee Orrico on Unsplash

1.4 Title image: Photo by Alexis Brown on Unsplash

1.4.1 Nurse image: Photo by Hush Naidoo on Unsplash

1.4.1 Yoga image: Photo by Bruce Mars on Unsplash

1.4.1 Woman with laptop talking image: Photo by Christina on Unsplash

1.5 Title image: Photo by Clem Onojeghuo on Unsplash

1.5.1 Group discussion image: Photo by Akson on Unsplash

1.5.3 Group laughing image: Photo by Priscilla Du Preez on Unsplash

1.5.3 Child yelling image: Photo by Jason Rosewell on Unsplash

1.6 Title Image: Photo by Bruce Mars on Unsplash

1.6.1 Chinese character graphic: By Tyler Poteet

1.6.2 Audience image: Photo by Product School on Unsplash

1.6.3 Woman image: Photo by Ujjwal Chouhan on Unsplash

1.6.4 Note-taking image: Photo by Climate Reality Project on Unsplash

1.6.5 Audience image: Photo by Stem List on Unsplash

1.6.5 Man giving presentation image: Photo by Austin Distel on Unsplash

1.6.5 Panoramic audience image: Photo by Samuel Pereira on Unsplash

1.7 Title image: Photo by Luan Cabral on Unsplash

1.7.2 Social media image: Photo by Austin Distel on Unsplash

2.1 Title image: Photo by Wonderlane on Unsplash

2.1.3 Picture frame image: Photo by Pine Watt on Unsplash

2.2 Title image: Photo by Marcel Heil on Unsplash

2.2.2 Bulletin board image: Photo by Jo Szczepanska on Unsplash

2.2.3 Creativity image: Photo by Alice Achterhof on Unsplash

2.3 Title image: Photo by Product School on Unsplash

2.4 Title image: Photo by NordWood Themes on Unsplash, edited 

2.4.3 Flipchart image: Photo by Arlington Research on Unsplash

2.4.4 Man presenting image: Photo by NeONBRAND on Unsplash

3.1 Title image: Photo by Joao Silas on Unsplash

3.1.2 Library image: Photo by Jason Leung on Unsplash

3.2 Title image: Photo by PNG Design on Unsplash

3.2.1 Language image: Photo by Hannah Wright on Unsplash

3.2.2 Dictionary image: Photo by Romain Vignes on Unsplash

3.2.3 President Kennedy image: Photo by History in HD on Unsplash 

3.3 Title image: Photo by Reimond de Zuniga on Unsplash

3.3.2 Woman about to present: Photo by William Moreland on Unsplash

4.1 Title image: Photo by Antenna on Unsplash

4.1.2 Man presenting image: Photo by Product School on Unsplash

4.1.2 Walt Disney & Mickey Mouse statue image: Photo by Travis Gergen on Unsplash

4.1.2 Man on moon image: Photo by NASA on Unsplash

4.1.2 Chemical plant image: Photo by Patrick Hendry on Unsplash

4.1.2 Louisville, KY image: Photo by Andrew Welch on Unsplash

4.2 Title image: Photo by Marco Oriolesi on Unsplash

4.2.4 Spirited discussion image: Photo by Sebastian Herrmann on Unsplash

4.3 Title image: Photo by Thomas William on Unsplash

4.3.1 Raised glass image: Photo by Patricia Beatrix Villaneuva on Unsplash

4.3.2 Father and son image: Photo by Nathan Anderson on Unsplash

4.3.2 Casket image: Photo by Rhodi Lopez on Unsplash

4.3.2 Intrigued man image: Photo by Clem Onojeghuo on Unsplash

5.1 Title image: Photo by Uriel Soberanes on Unsplash

5.1.1 Man being interviewed image: Photo by Austin Distel on Unsplash

5.1.2 Man on laptop image: Photo by Wes Hicks on Unsplash

5.1.2 iPhone screen image: Photo by Sara Kurfeß on Unsplash

5.1.2 Sparkler image: Photo by Krister on Unsplash

5.1.3 Emojis graphic: Image by Emojipedia

5.1.4 Group pointing at laptop screen image: Photo by John Schnobrich on Unsplash

5.1.5 Man vlogging image: Photo by lucas clarysse on Unsplash

Unlisted Graphics Throughout: Custom by Power of Public Speaking

Unlisted Photos Throughout: Stock images by Wix

Cartoon Human Graphics Throughout: Humaaans by Pablo Stanley