Felipe V de España —
Photo Credit: By Louis-Michel van Loo - Public Domain, https://commons.wikimedia.org/w/index.php?curid=7683986

Portrait of Charles III — Anton Raphael Mengs, ca. 1765
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=4727473

John Paul Jones —
Photo Credit: By Charles Willson Peale - Public Domain, https://commons.wikimedia.org/w/index.php?curid=9753295

Vitalik announcing Ethereum — Ethereum’s public announcement at The North American Bitcoin Conference in Miami, Florida, USA - January 25, 2014
Photo Credit: Marc van der Chijs - https://blog.ethereum.org/2016/02/09/cut-and-try-building-a-dream

Gavin Wood contacts Vitalik Buterin —
Photo Credit: https://vitalik.ca/general/2017/09/14/prehistory.html

Aerial view of the University of Kiel central campus —
Photo Credit: By Klaas Ole Kürtz (Drbashir117) - Own work, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=84102

Seal of the University of Kiel —
Photo Credit: By University of Kiel - Public Domain, https://commons.wikimedia.org/w/index.php?curid=71284817

Plot of the probability mass function for the Poisson distribution —
Photo Credit: By Skbkekas - Own workiThe source code of this SVG is valid.This plot was created with Matplotlib., CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=9447142

Siméon Denis Poisson —
Photo Credit: By François Séraphin Delpech - .Public Domain, https://commons.wikimedia.org/w/index.php?curid=378439

Portrait of Évariste Galois aged about 15 —
Photo Credit: Galois - Œuvres mathématiques, Gauthier-Villars, 1897, p.18, Public Domain, https://commons.wikimedia.org/w/index.php?curid=28955392

Bitcoin genesis block — Satoshi Nakamoto message embedded in the coinbase of the first block
Photo Credit: By MikeG001 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=83911930