Alger on Harvard Commencement Day, July 1852 —
Photo Credit: By Whipple, John Adams - Public Domain, https://commons.wikimedia.org/w/index.php?curid=20407260

Horatio Alger Jr —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=541024

William Franklin —
Photo Credit: By Attributed to Mather Brown - Public Domain, https://commons.wikimedia.org/w/index.php?curid=4635381

4th Edition of Experiments and Observations on Electricity — Exhibit in the Franklin Institute, Philadelphia, Pennsylvania, USA,, showing Franklin's bifocals on the 4th edition of his book.
Photo Credit: By Daderot - Self-photographed, Public Domain, https://commons.wikimedia.org/w/index.php?curid=17126777

Title page of Experiments and Observations on Electricity — Title page of 1751 original publication
Photo Credit: By E. Cave - printer - Public Domain, https://commons.wikimedia.org/w/index.php?curid=56312567

cover of Florae Parisiensis Prodromus — by Thomas-François Dalibard
Photo Credit: https://www.amazon.com/Parisiensis-Prodromus-Catalogue-Rapport%C3%A9es-D%C3%A9nominations/dp/0243512740

Thomas-François Dalibard —
Photo Credit: http://telescoop.tv/people/63056/thomas-francois-dalibard.html

Dalibard's lightning experiment, 1752 —
Photo Credit:

Yvonne Choquet-Bruhat — At the workshop "Mathematical Aspects of General Relativity" in Oberwolfach, 2006.
Photo Credit: By Renate Schmid - https://opc.mfo.de/detail?photo_id=7800, CC BY-SA 2.0 de, https://commons.wikimedia.org/w/index.php?curid=11209318

Entrance of the historic building of the ENS — At 45, rue d'Ulm. The inscriptions on the pediment of the monumental doorway display the school's two dates of creation (the first, in the oculus, under the National Convention) and date of installation in this premise.
Photo Credit: By Guilhem Vellut - Flickr: ENS, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=27380426

logo for École Normale Supérieure —
Photo Credit: By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=52177135