Archive for Pu-Ehr

tea tasting at Van Cha

Posted in Kids, pictures, Travel with tags , , , , , , , , , , , , , on December 26, 2019 by xi'an

This recent trip to Vancouver gave me the opportunity of enjoying a Chinese tea tasting experience. On my last visit to the city, I had noticed a small tea shop very near the convention centre but could not find the time to stop there. This round I took advantage of the AABI lunch break to get back to the shop, which was open (on a Sunday), and sat for a ripe Pu-Ehr tasting. A fatal if minor mistake in ordering, namely that this was Pu-Ehr withing a dried yuzu shell, which gave the tea a mixed taste of fruit and tea, as least for the first brews. And remaining very far from the very earthy tastes I was expecting. (But it reminded me of a tangerine based Pu-Ehr Yulia gave me last time we went to Banff. And I missed an ice climbing opportunity!)
This was nonetheless a very pleasant tasting experience, with the tea hostess brewing one tiny tea pot after another, including a first one to wet and clean the tea, with very short infusion times, and tea rounds keeping their strong flavour even after several passes. In a very quiet atmosphere altogether, with a well-used piece of wood (as shown on top) in lieu of a sink to get rid of the water used to warm and clean pots and mugs (and a clay frog which role remained mysterious throughout!).
At some point in the degustation, another customer came in, obviously from a quite different league as he was carrying his own tea pancake, from which the hostess extracted a few grams and processed most carefully. This must have been an exceptional tea as she was rewarded by a small cup of the first brew, which she seemed to appreciate a lot (albeit in Chinese so I could not say).
As I was about to leave, having spent more time than expected and drank five brews of my tea, plus extra cups of a delicate Oolong, hence missing a talk by Matt Hoffman to which I was looking forward!, I discussed for a little while with this connoisseur, who told me of the importance of using porous clay pots and not mix them for different teas. Incidentally he was also quite dismissive of Japanese teas, (iron) teapots, and tea ceremony, which I found in petto a rather amusing attitude (if expected from some aficionados).

Nature tea[dbits]

Posted in Books, pictures, University life, Wines with tags , , , , , , , , , , , , , , , , on February 28, 2019 by xi'an

A very special issue of Nature (7 February 2019, vol. 556, no. 7742). With an outlook section on tea, plus a few research papers (and ads) on my principal beverage. News about the REF, Elsevier’s and Huawei’s woes with the University of California, the dangerous weakening of Title IX by the Trump administration, and a long report on the statistical analysis of Hurricane Maria deaths, involving mostly epidemiologists, but also Patrick Ball who took part in our Bayes for Good workshop at CIRM. Plus China’s food crisis and ways to reduce cropland losses and food waste. Concerning the tea part(y), a philogenetic study of different samples led to the theory that tea was domesticated thrice, twice in Yunnan (China) and once in Assam (India), with a divergence estimated at more than twenty thousand years ago. Another article on Pu-Ehr, with the potential impacts of climate change on this very unique tea. With a further remark that higher altitudes increase the anti-oxydant level of tea… And a fascinating description of agro-forestry where tea and vegetables are grown in a forest that regulates sun exposure, moisture evaporation, and soil nutrients.

2013 WSC, Hong Kong

Posted in Books, pictures, Running, Statistics, Travel, University life with tags , , , , , , , , , on August 28, 2013 by xi'an

HongKong1After an early but taxing morning run overlooking the city, and a recovery breakfast (!), I went from my flat to the nearby Hong Kong Convention Centre where the ISI (2013 WSC) meeting is taking place. I had a few chats with friends and publishers (!), then read a chapter of Rissanen’s book over an iced coffee before attending the Bernoulli session. This was a fairly unusual session with a mix of history of probability, philosophy of probability and statistics, and computational issues (my talk). Edith Sylla gave some arguments as to why Ars Conjectandi (that she translated) was the first probability book ever. Krzys Burdzy defended his perspective on why von Mises and de Finetti were wrong (in their foundational views of statistics). And I gave my talk on a mixture of Bernoulli factory, Russian roulette and ABC  (After my talk, Victor Perez Abreu told me that Jakob Bernoulli had presumably used simulation to evaluate the variance of the empirical mean in the Bernoulli case.) What I found most interesting in the historical talk was that Bernoulli had proven his result in the late 1680’s but he waited to complete his book on moral and commercial issues, waited too long since he died before. This reminded me of Hume using probabilistic arguments a few years later to disprove the existence of miracles. And of Price waiting for Bayes’ theorem to counter Hume. The talk by Krzys was a quick summary of the views exposed in his book, which unsurprisingly did not convince me that von Mises and de Finetti (a) had failed and (b) needed to use a new set of (six) axioms to define probability. I often reflected on the fact that when von Mises and de Finetti state(d) that probability does not exist, they applied the argument to a single event and this does not lead to a paradox in my opinion. Anyway, this talk of Krzys’ induced most of the comments from the floor, my own talk being in fine too technical to fit in this historical session. (And then there was still some time to get to a tea shop in Sheng Wan to buy some Pu Ehr, if not the HK$3000 variety…!)

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