Tootfinder

"Tiling with Three Polygons is Undecidable"
Erik D. Demaine; Stefan Langerman 17 Sep 2024
Abstract
We prove that the following problem is co-RE-complete and thus undecidable: given three simple polygons, is there a tiling of the plane where every tile is an isometry of one of the three polygons (either allowing or forbidding reflections)? This result improves on the best previous construction which requires five polygons.
...
It remains open whether tiling …

There is a long and storied history of whistles for protection. Ancient Egyptian guards used to place a blade of grass between the thumbs to alert other guards of issues that were transpiring. Later, shells were used to the same end. In China, acorns with holes drilled in them were used similarly.
As a dedicated instrument, whistles have been made of wood, bone, metal, and later, plastics. British bobbies have used whistles to communicate over distances since the 1880s. They are a commonly used tool for boatswains, crossing guards, and referees.
I wish I knew more about rape whistles, but they seem similar in functionality to hikers taking whistles with them in case of injury, as the sound carries much further than yelling, and is much less tiring.
As someone regularly stalked by a large creepy harasser, I am grateful for the whistle I was given for self-protection, even if the creeps who it was given to defend against resent the fuck out of it.
Fin.

[ May 2, 2025 - May 3, 2025] Conference or similar: 2025 Mountain-Pacific Meeting of the Society of Christian Philosophers https://philevents.org/event/show/129066

2025 Mountain-Pacific Meeting of the Society of Christian Philosophers
CFP: Religious Perspectives on the Good Life Paper Submissions We invite submissions on any topic in philosophy, with preference given to philosophy of religion, and very strong preference given to submissions that engage with the conference theme, broadly and globally construed. Please note the following submission guidelines:  Long abstracts (750-1000 words) are preferred. Full paper submissions of no more than 3000 words are also accepted. Please prepare your submission for anonymous revie…

Series C, Episode 01 - Aftermath
MELLANBY: Come and sit down.
AVON: Thank you.
https://blake.torpidity.net/m/301/185 B7B4

Blakes7Bot | Search
Companion site to the Blakes7Bot Twitter, Mastodon, and Bluesky accounts. Automated lines of Blakes 7 dialog. Includes a script search facility.

Series A, Episode 11 - Bounty
JENNA: Goodbye.
TYCE: Goodbye, Blake. You'll always be welcome on Lindor.
https://blake.torpidity.net/m/111/541 B7B3

Blakes7Bot | Search
Companion site to the Blakes7Bot Twitter, Mastodon, and Bluesky accounts. Automated lines of Blakes 7 dialog. Includes a script search facility.