Ad Asstra Per Asspera

The shape of a fish's caudal tail can tell you a lot about how fast the fish moves! A rounded tail is the slowest and a lunate tail is the fastest! The lunate tail has the most optimal ratio of high thrust and low draw, making it the fastest.

A diagram comparing a human hand to the equivalent limb in other mammals from Henry Fairfield Osborn's The age of mammals in Europe, Asia and North America (1910).

abortion clicker mid game: you own hundreds of clinics as well as think-tanks which dismantle sex ed courses as well as politicians which strengthen pro choice institutions

OP: Why couldn’t traditional Chinese Yinpiao银票/silver drafts be forged if they were merely slips of paper? (cr大明宝钞，渐越)

Traditional Chinese yinpiao/silver drafts were paper vouchers issued by private banks starting from the Song Dynasty(960–1279). People could exchange these slips for physical silver at bank branches across the country.

Silver drafts were made in multiple copies with matching serrated seal edges. One copy went to the customer and others stayed at the bank. All edges had to fit perfectly together to withdraw silver. The unique split edge marks were almost impossible to copy.

This mechanism is known as qifeng骑缝 (split-joint seal) in China. It first originated in the Western Zhou Dynasty (1046–771 BC). The Rites of Zhou records that contracts were written on bamboo or wooden slips in duplicate. Notches and marks were carved in the middle before splitting the slips, with each party keeping one half. The two halves would be matched by their notches for verification.

During the Spring and Autumn and Warring States periods (770–221 BC), this idea evolved into hufu虎符/tiger tally tokens. A military tally was split into two pieces with identical inscriptions carved along the split edge. Troops could only be deployed if the patterns and characters on both halves perfectly aligned, serving as a metal version of the split-joint anti-counterfeiting system.

The technology matured in the Tang Dynasty (618–907). Government documents and private contracts commonly used split-joint seals stamped across the dividing line. The Chinese character "hetong合同" (contract) was written across the middle before the paper was torn apart, so the complete characters would only appear when the two halves were put together. This split-coupon system was later adopted for Song Dynasty (960–1279) jiaozi paper money and yinpiao/silver drafts of the Ming and Qing dynasties (1368–1912).

Official Song dynasty paper money (Jiaozi交子) was abolished in 1107. Private silver drafts issued by Qing-era piaohao票行 (ancient exchange banks) vanished completely in 1951, hit hard by modern banks and currency reforms. Nowadays silver drafts no longer circulate as currency. Their collectible value depends on their rarity and physical condition.

First they were called "chirographs", but later the word "indenture" (in its earliest meaning as just a legal document of any kind between two people) came to be used, originating from the practice of a contract being written twice on a single piece of parchment and then cut in half with serrated edges (as in dent, "teeth" -> indents -> indenture) in order for each party to take one half, so they could later piece them together and verify that there had been no forgery -- same as the Chinese silver drafts!

(Charter of the Clerecía de Ledesma, 1252, showing the serrated indents at the top -- presumably they are cutting rather than tearing because they're using parchment, which I expect is much harder to tear than wood-pulp paper like the Chinese were using)

德化白瓷 Déhuà báicí/dehua white porcelain

Dehua County, located in Quanzhou, Fujian, China, is renowned for its white porcelain.

Its kilns flourished during the Tang (618-907 CE) and Song dynasties(960–1279 CE), peaked in the Yuan and Ming periods, and remain famous today, particularly for their white porcelain. Fired at high temperatures, the unglazed porcelain exhibits a smooth, jade-like texture, appearing crystal-clear and pure white.

The blurb said the shot was taken in Granada, Spain, by Agneta Fondén.  No other info, so I have no idea how old, etc.  There's a game (from 1988) that uses a similar pattern on one of its pieces, but this could predate it by at least a thousand years  — or not.  But the pattern intrigued me, so I made a texture map and used Blender's geometry nodes (no generative AI) to set up a hexagon grid with random rotations for the tiles:

That's all done with a single design:

You'd think this would have a name, right?  (For its historical use as an architectural / decor tile — although I've found out more about its use in games, that's not what I'm looking for.)  Like the Penroses do (and no, it's not one of those).  But I've had no luck finding it, or any other info.  Any (human only, please) help?

Basalt Pebble Carved as a Mouflon, Indus Valley, 3rd millennium BC.