lights all askew in the heavens

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)

Building a home for a toadlet

Rabbits

Not all of the advice in every book is going to help; there are some aspects of grief I doubt any book can actually help with. But the recommendations are successful, I'd guess, because a) reading can occupy your mind when you're grieving (and you might as well read about grief because you're not going to be distracted from it), b) learning something new helps people feel more in control of their life & environment and can offer a sense of hope, c) even if the recipient never reads any of the books, being given a book list is a way to say "I care about you and want to help" which is a good message to send. From my own grief experience I also think it's especially powerful to hear "I went through something similar to you and this is what helped me" - it's proof there's life on the other side.

Anyway, 2 more book recs for 2 quite different end-of-life outcomes, which I think you should ideally read before any of your loved ones die so you can actually use the information (also, honestly? Very helpful writing research):

Final Journeys and Final Gifts by Maggie Callanan -- a hospice nurse's guide to the kinds of decisions, conflicts, and sometimes puzzling behavior and experiences encountered when a loved one is in palliative care. Journeys is the more broadly practical book (from the 'writing research' perspective, it also offers some great examples of conflict, memorable scenes, and psychology insights); Gifts looks particularly at spiritual experiences at the end of life, including end of life visions (which happen to all kinds of people and can be a good thing to be prepared for regardless of your own spiritual beliefs). If Gifts proves fascinating, a more recent book on the subject of end of life experiences is Death is But a Dream.