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6 months ago
drdavidanderson
Susan, A little bit of a quibble here. Almost all of our Vitamin D in nature is not dietary in origin, but comes from skin exposure to UV light of a specific wavelength that is needed to cleave the B ring of dihydrotachysterol to pre-Vitamin D3, which is then hydroxylated in the liver to the main storage form, 25-hydroxycholecalciferol. They did not depend on dietary sources because they will I
Forum: Author of the Month
6 months ago
drdavidanderson
I was fascinated to read your article, which I did initially out of curiosity to see what my successor as AoM had to say! I am a retired endocrinologist and would say without doubt that your Adena giants had gigantism caused by either familial predisposition to Growth hormone secreting tumours (curiously called adenomas), or some other familial defect in Growth Hormone regulation or function. Thi
Forum: Author of the Month
6 months ago
drdavidanderson
Thanks Ray, but is it testable? And if so how? Someone has to tell those in authority in China that it is a serious hypothesis and only they are in a geographical position to test it, by finding the location of the glass mine that is still open. And that the economic stakes for them are high. Personally I find it a plausible hypothesis, and once they having found the glass mine(s) (which would co
Forum: Author of the Month
6 months ago
drdavidanderson
Alternative model in which more energised waist fragment makes a big splash in the Pacific on a line with Hawaii, while glass lands in Tong Liao While ack at home.... Russian contour map, thanks to Michael Schieber And ten times exaggerated profile, courtesy Martin Rusak, NASA. Down impact crack and secondary volcanism causes Yolanda Ridg
Forum: Author of the Month
6 months ago
drdavidanderson
I would like to thank everyone who has taken the time to study my various posts and the accompanying images. I hope you are convinced of the importance of this Culture. and of these objects as a window on an art-loving ancient people based in Inner Mongolia. Incidentally this month I paid for Oxford Authentication Ltd to do a thermoluminescence test on a pottery shard I picked up in 2004 from Ni
Forum: Author of the Month
6 months ago
drdavidanderson
Andrew, I was referring to the score mark on the inside, which must have been made by a spinning disc. The same sort of thing is seen on the inside of the two large skulls. It doesn't have to be a stone disc, it just needs to be inlaid with microdiamonds around the periphery. A hardwood disc with diamond powder stuck on with resin would surely work? By the way on many if not all of these piece
Forum: Author of the Month
6 months ago
drdavidanderson
Rob Potter of Johnson Matthey has seen it, and they have tested it for other minerals, and there are no additives or modifiers. The background clear glass is pure SiO2, as is LDG, which noone doubts is of impact origin. True, silica glass can be made synthetically, but needs ovens that go above 1600C, and a very good reason to do so. Plus the holes in the tubes must be natural.
Forum: Author of the Month
6 months ago
drdavidanderson
I am nearing the end of my Author of the Month month, and I thought that as my penultimate posting I would show you eight or nine vessels which seem to have been used for ceremonial purposes, two in jade, one in agate and the rest in shui jing glass. The predominance of the latter is mainly due to low cost and availability on Ebay at the time of purchase. First, I have two spectacular vessels in
Forum: Author of the Month
6 months ago
drdavidanderson
Thank you James for those kind comments. No, I have not detected any weathering, nor have I looked for extraneous crystal growth under the microscope. Good idea, now I have resuscitated my microscope. The three pieces of Shui Jing that have been subjected to compositional analysis show the clear areas are pure SiO2 glass, melting temperature in excess of 1,600C, similar to Libyan desert Glass, wh
Forum: Author of the Month
7 months ago
drdavidanderson
I thought you would like to see some Hongshan discs, and compare them with a few other discs I have from other, mainly later, cultures. You will notice that there is some resonance with Hongshan on notched discs from later cultures. Notice also weathering, including on the Han pieces. First some notched discs, starting with the largest, which contains both root mark-dictated crystal hydration
Forum: Author of the Month
7 months ago
drdavidanderson
Thanks for your interest, Andrew. No, I don't see any evidence of organic material. There is an interesting difference between the two large skulls, with the Cobalt blue one being beautifully polished on the inside down to the depths of the eye sockets, the clear glass one not. That is why you see the rough surface through from the outside only on the clear skull. On the cobalt skull you can only
Forum: Author of the Month
7 months ago
drdavidanderson
I can see that sex and its relevant official organs is not a great switch-on for the latter-day Hancock Hongshanista, so to liven things up a bit towards the end of this, the shortest, AoM month, I’ll try something REALLY depressing. What is left, when sex is no longer even a memory, and the dongler, now shorter, no longer even dangles, let alone is any use for a consensual shared dongle? The ans
Forum: Author of the Month
7 months ago
drdavidanderson
Thanks Andrew for your interest and for bringing your brain to bear on these discs. Will reflect on it further!!
Forum: Author of the Month
7 months ago
drdavidanderson
I don’t think we can leave the Hongshan Culture and its apparent official denial, without considering its obsession with the genital organs and the sexual act. Sex education remains vestigial in China, and the attitude to this day borders on prudery. This was compounded by the ‘unisex’ culture under Mao, although like many psychopaths he himself was a highly active sexual predator. So one el
Forum: Author of the Month
7 months ago
drdavidanderson
Drew, Let’s forget about the larger discs, since I only have two. And I see no rectangular tiles with no holes. So let’s concentrate on the 73 discs of diameter 55 or 49 cm, which were carved from turned cylinders and all of which use a common iconography. You are postulating a game played with items that were obviously time-consuming and therefore expensive to make. In any complex economy yo
Forum: Author of the Month
7 months ago
drdavidanderson
I am posting this as a new thread. Here are the images of six Shui Jing glass plaques, with precisely the same images as seen on the discs. This glass must have come from a sheet of around 1 cm thick which which pooled and cooled on a flat area, because on the underneath they have some attached ground melt. Inneressing innit?!
Forum: Author of the Month
7 months ago
drdavidanderson
Thanks Wheeler. Of course I have no idea where these came from, and how many more there are. It seems likely they were buried in a tomb. Maybe they were stashed away by someone wealthy. We have no idea; it's just that I saw a whole lot come onto the market together, and thought they should stay together for posterity and academic study. David
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7 months ago
drdavidanderson
Or possibly fondled, handled, and exchanged for larger possessions, such as cows and pigs. In other words currency!! In fact, I wonder if the same thing applies to the small tubes, especially the ones that have been hand drilled. They are much less fragile than the large ones.
Forum: Author of the Month
7 months ago
drdavidanderson
Well, you are postulating wind chimes, which I find unlikely, since they are easily broken, and it would seem to be a rather trivial function for items of such complexity and craftmanship, made out of an absolutely unique natural material. IMHO the best of these were made for the top man or woman, had religious significance, and were ultimately buried with him or her, but we won't know, since Chi
Forum: Author of the Month
7 months ago
drdavidanderson
I don't like the idea of these as chimes for several reasons. First, why use a unique and irreplaceable natural material to produce something to ping or tinkle that would be much better made in bronze? Second, I have suspended the two with dragon heads and holes in the face, and of course if you tap them they give out a note - about a third in difference with the shortest tube giving the higher n
Forum: Author of the Month
7 months ago
drdavidanderson
21. Re: lol
I am not able to load them, Andrew.
Forum: Author of the Month
7 months ago
drdavidanderson
Andrew, I have worked on the discs today, and put them into some order, hopefully with the fronts and backs of all the pieces. Obviously I would really appreciate the opinion of someone conversant with Chinese scripts. I still think they were used as currency. They show great variation in the amount of wear (which is consistent for front and back of the pieces). So here goes. There are 19 grou
Forum: Author of the Month
7 months ago
drdavidanderson
Sorry, Wheeler, but I don't see any glsss tubes there. davic
Forum: Author of the Month
7 months ago
drdavidanderson
Thanks for those thoughts, Andrew, upon which I shall reflect when back in Italy and I can look at them all together, and at the simple analysis I did on them shortly after I got them. At the moment I am in a hotel at Stansted, and about to go down for breakfast! David
Forum: Author of the Month
7 months ago
drdavidanderson
A number of the discs show considerable wear. When I get home tomorrow I'll look some of these out. The material is very interesting, because as far as I can see no one in China knows what it is. They just call it lin fong shi (綠松石) - ie turquoise). Some of the discs and other carvings in this material are turquoise in colour, some a darker blue, and others are greenish. This may well depend on t
Forum: Author of the Month
7 months ago
drdavidanderson
Wheeler, thanks. This illustrates the problem with all the main official organs of collection and sale for the highly moneyed. They have no control over amount buried or excavated and therefore have to define 99.9% of those on the UNESCO/UNIDROIT-disapproved market as fake. Just compare the two zhulongs illustrated in my book. The fake, on proud display in Shenyang Musaum, is valued at $2.5 mill
Forum: Author of the Month
7 months ago
drdavidanderson
And now for something completely different. I bought a job lot of these fascinating discs on Ebay 10 years ago, for $5.00 each. I also have some classical Hongshan pendants carved in the same material. First, what is the material? Well, Peter Tovey of the Natural History Museum ten years ago did an analysis of powder from drilling a hole, and it consists of equal amounts of calcite and dolomit
Forum: Author of the Month
7 months ago
drdavidanderson
Wheeler, the bubbles, small and big, long and short are all lined up parallel to the long axis of the tubes and the central holes. IMHO the glass, being pure silica with a melting temperature of more than 1,600C, is natural, but of course it has been worked by Man. I can post images of some small tubes with central holes that were drilled by Man, and they are all over the place.
Forum: Author of the Month
7 months ago
drdavidanderson
Oh, I am sure they were turned on a lathe, with microdiamond-tipped tools, and then carved by grinding using a bow drill with diamond-encrusted tip. The glass only starts to become malleable above 1400C, temperatures they could not have achieved. I am in England for a few days and will do more work when I get back. But remember the toggles I have posted are made from the same material, with tiny
Forum: Author of the Month
7 months ago
drdavidanderson
The longest tube I have measures 54 cm on length. They range right down to 4 cm. To me, what they were used for is much less interesting than how the holes were formed, and how they were made, Remember, in cross section, they are circular, hemicircular, hemicircular with a right angle, triangular, and square. One of the circular ones has four longitudinal score marks, as if a piece of bamboo with
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