Big bundles of thanks to Lex1nat0r,
minmin, and
ghostpage for their help over on IRC.
Image credit (modified by myself)
(I wonder if I can keep up with posting one article a week…)
I added two more images on 2018-07-08.
First: cropped screenshot of a video accompanying an academic paper. The paper was published in an open-access journal. I credit the authors of this paper: Zitterbart D, Wienecke B, Butler J, and Fabry B.
Second: CC0 photo found on Pixabay.