The solidity language logo —
Photo Credit: By Ethereum Foundation - https://solidity.readthedocs.io/en/develop/_images/logo.svg, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=64533335

Ethereum icon —
Photo Credit: By GitR0n1n - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=87492216

Vitalik Buterin receives Honorary Doctorate — From the Faculty of Business and Economics of the University of Basel on the occasion of the Dies Academicus on 30 November 2018
Photo Credit: https://cif.unibas.ch/en/blog/details/news/vitalik-buterin-receives-honorary-doctorate/

Davis Computer Research Centre, UWaterloo — The William G. Davis Computer Research Centre houses teaching facilities and a library for engineering, mathematics and science.
Photo Credit: By Victor Vucicevich - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=22533119

logo for University of Waterloo —
Photo Credit: By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=58639615

Vitalik Buterin —
Photo Credit: By Romanpoet - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=49232633

Emperor Jing of Han — in the Sancai Tuhui - cropped
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=76417296

Empress Dou 竇皇后 —
Photo Credit: (c) 2020 alasnome.com

Emperor Wen of Han —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=34807286

Consort Bo, concubine of Emperor Gaozu of Han — from statue The Twenty-four Filial Exemplars - No. 7
Photo Credit: By Dingar - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4167912

劉弘 Liu Hong —
Photo Credit: (c) 2020 ShaneBow