The Eternal Doorman

This is a really inspiring talk given at The NSF-Simons National Institute for Theory and Mathematics in Biology in June [2025]. See Arthur Winfree's 1980 book The Geometry of Biological Time .     See also  Anton Petrov on Ultra Weak Biophoton Emission and Time Crystals . Subscribe to  NITMB Chicago . I'm reposting this, from a year or so ago, because of the Institut Henri Poincaré thing this morning which asked "What kind of knot is a person?" and it really made me think. Especially, it reminded me of this idea of Algebraic Automata theory . I had never heard of that, but it is about as old an idea as Automata theory itself. See Attila Egri-Nagy on a Concatenative Logic Programming Language .  It seems that lots of things, like knot theory and automata theory, for example, are only accidentally in different categories: if history had been otherwise, then maybe we would have sliced it all up quite differently and we would be amazed by theorems relating knots...

The void here is apparently the Green P car park, on a rooftop in Kensington Market, Toronto. ?! See Laura Pausini - Turista (Official Video) . We need some Nihil Declarandum  here too. Get her new album at  https://laurapausini.lnk.to/iocanto2 . See Laura Pausini Announcing her New Album and Another World Tour . Subscribe to Laura Pausini . Original by Raf: Subscribe to Warner Musica Italia . I also saw this this morning. It's a Green Pod, for peas, ... They seem slightly desperate to me. I suppose it's only to be expected, the economy being what it is:  Subscribe to Maserati .

See  Alianza por la Solidaridad Andina - Voces Silenciadas, Espacios Reducidos .  Subscribe to Alianza por  la Solidaridad Andina . Tiffany Kimmel - Civil Service Interesting project, Nihil Declarandum . You wonder what the hell they're going to do next !: Nihil Declarandum is a creative company based in Highland Park, Los Angeles and the UK. Its mission is to create artist-driven works that tell uncomfortable truths, forgotten histories, and family secrets on a "need-to-tell" basis. Nihil & Friends designs and produces animated and live-action projects and events that are hand-crafted, emotional, and tactile. Subscribe to Dust and Nihil Declarandum .

I think of it as an advanced course in Security Engineering for Linux Users. See Security Engineering for Linux Users and Anti-Tempest Software and Pulp Fiction . Put together with Shadow TCP stacks in OpenBSD and  The T.H.E. Multiprogramming System Mk II  I dread to think what sort of thing the Internet could have become . Subscribe to Nir Lichtmann . 

What kind of knot are you? See Steven Strogatz on Mathematics, Biology and the Value of Simple Models  and Angela Collier's Funding Application . Subscribe to  Institut Henri Poincaré .

See Paronychia leucochthonicola (Caryophyllaceae: Paronychieae), a new species of the San Luis Valley, north-central New Mexico and adjacent Colorado by Cecilia Alexander . See her blog  and this post from 2011: Botany is hard .  So is being a Hernández's short-horned lizard . Fucking botanists! Imagine what it's like in a snowstorm up there. Doesn't bear thinking about. Subscribe to Crime Pays but Botany Doesn't . See also  Seven Year Study in Santa Fé NM Proves Native Plants Drought-proof Landscapes . 

The Atari 2600 cost around US$ 189 when it was released in 1977 and sold around 30 million units. The machine had only 128 Bytes of RAM memory and a 4KB ROM program memory on each cartridge. You can download a zip file containing a 4096 byte ROM image from https://www.atarimania.com/games/atari-2600-games-pitfall-14162 It runs in JavaScript in a web browser. Try https://javatari.org/?ROM=https://www.atarimania.com/2600/dumps/pitfall_cce.zip  It's too difficult for me! There is a user manual : You can disassemble the .a26 ROM images at https://www.masswerk.at/6502/disassembler.html . The reset vector for 6502 processor family is a 16-bit address stored at 0xFFFC and 0xFFFD: The 4KB ROM on the Atari 2600 is mapped at $F000-$FFFF even though the 6507 variant of the 6502 CPU had only a 13 bit address bus, it was internally the same silicon, so the 8KB of accessible memory was effectively mapped eight times through the full 16 bit (65KB) address space: Subscribe to VCF . Amazing ra...

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