Add Richards.

README.md

@@ -1997,8 +1997,9 @@ years](img/All_palaeotemps.svg)](https://commons.wikimedia.org/wiki/File:All_pal
 - 1969 CE: [Donald Knuth](https://en.wikipedia.org/wiki/Donald_Knuth) published [*The Art of Computer Programming, volume 2*](https://en.wikipedia.org/wiki/The_Art_of_Computer_Programming)
 - 1969 CE: [NASA's Apollo 11 mission](https://en.wikipedia.org/wiki/Apollo_11) landed 2 people on the Moon, and returned them to the Earth alive
 - 1969 CE: [Robert Whittaker](https://en.wikipedia.org/wiki/Robert_Whittaker) published [*New Concepts of Kingdoms of Organisms*](https://science.sciencemag.org/content/163/3863/150)
+- 1969 CE: [Martin Richards](https://en.wikipedia.org/wiki/Martin_Richards_%28computer_scientist_%29) published [*BCPL: a tool for compiler writing and system programming*](https://dl.acm.org/doi/10.1145/1476793.1476880), describing [BCPL ("Basic Combined Programming Language")](https://en.wikipedia.org/wiki/BCPL)
 - 1969 CE: [Ken Thompson](https://en.wikipedia.org/wiki/Ken_Thompson), [Dennis Ritchie](https://en.wikipedia.org/wiki/Dennis_Ritchie), & Rudd Canaday [implemented Unix in assembly for the PDP-7 computer](https://en.wikipedia.org/wiki/History_of_Unix)
-- 1969 CE: [Ken Thompson](https://en.wikipedia.org/wiki/Ken_Thompson) & [Dennis Ritchie](https://en.wikipedia.org/wiki/Dennis_Ritchie) developed [the B programming language](https://en.wikipedia.org/wiki/B_%28programming_language%29)
+- 1969 CE: [Ken Thompson](https://en.wikipedia.org/wiki/Ken_Thompson) & [Dennis Ritchie](https://en.wikipedia.org/wiki/Dennis_Ritchie) developed [the B programming language](https://en.wikipedia.org/wiki/B_%28programming_language%29), based on [BCPL](https://en.wikipedia.org/wiki/BCPL)
 - 1969 CE: [Willard Boyle](https://en.wikipedia.org/wiki/Willard_Boyle) & [George E. Smith](https://en.wikipedia.org/wiki/George_E._Smith) invented the [charge-coupled device (CCD)](https://en.wikipedia.org/wiki/Charge-coupled_device)
 - 1969 CE: [James H. Ellis](https://en.wikipedia.org/wiki/James_H._Ellis), [Clifford Cocks](https://en.wikipedia.org/wiki/Clifford_Cocks), and [Malcolm J. Williamson](https://en.wikipedia.org/wiki/Malcolm_J._Williamson) of [GCHQ](https://en.wikipedia.org/wiki/GCHQ) published *The Possibility of Secure Non-Secret Digital Encryption*, proposing public-key [cryptography](https://en.wikipedia.org/wiki/Public-key_cryptography)
 - 1969 CE: [Charles Goldfarb](https://en.wikipedia.org/wiki/Charles_Goldfarb), Edward Mosher, & Raymond Lorie developed [Generalized Markup Language (GML)](https://en.wikipedia.org/wiki/IBM_Generalized_Markup_Language), the first markup language