[Rockhounds] Why did trilobites go extinct?

[Paul]

Why did trilobites go extinct?
By Donavyn Coffey, Live Science, November 2020
https://www.livescience.com/why-trilobites-went-extinct.html

The paper is:

Jonathan L. Payne, Alexandra V. Turchyn, Adina Paytan,
Donald J. DePaolo, Daniel J. Lehrmann, Meiyi Yu, and
Wei, Calcium isotope constraints on the end-Permian
mass extinction. PNAS May 11, 2010 107 (19) 8543-8548
https://www.pnas.org/content/107/19/8543

A totally unrelated article is:

The role of cat eye narrowing in cat-human communication
by Ellie Bennett, Snippet Science, November 2020
https://www.snippetscience.com/the-role-of-cat-eye-narrowing-in-cat-human-communication

The open access paper is:

Humphrey T, Proops L, Forman J, Spooner R and McComb
K. The role of cat eye narrowing movements in cat-human
communication. Sci Rep. 2020 Oct. 10, 16503
https://doi.org/10.1038/s41598-020-73426-0

Yours,

Paul H.