(反對)開夜車 2.4

本文章並(!)不(!)可作為醫學建議。如需專業意見,請諮詢專業人士。

至於,我自己的案例,則幸好是良性的,不會致盲;只要飛蚊不惡化,視力不會減弱。

(問:但你剛才說,飛蚊症「會帶來精神困擾」?)

無錯。可以說是心靈創傷。

(問:為什麼呢?)

如果你買了一個電腦熒光幕,發現有死點,你會怎樣做?

(問:立刻要求商戶更換。新買的電器,必定在保養期內,可以更換。)

假設不可更換呢?

(問:如果只是一兩點的話,應該不會太明顯。我會先用它,直到幾年後才再換。

但是,如果不只是一兩點的話,我可能會忍受不到;如果我負擔得起,我會立刻買過另一部。)

再假設,你永久不能更換熒光幕呢?

(問:永久有死點?)

無錯。

(問:那又真的,十分不自在。

你的意思是,「熒光幕永久有死點」就是患飛蚊症的感受?)

無錯。

所以,患了飛蚊症以後,我一聽到「不可逆轉」這四個字,就有一點兒緊張;患了飛蚊症以後,我以為,我人生不可能再快樂。

幸好,一年之後,我竟然習慣了——只要飛蚊不惡化,我就不會因為那些「死點」,而明顯不開心。

(問:「只要飛蚊不惡化」?你怎能保證?)

不能。那正正就是,我更大的苦惱。

一日不能知道,我當年開始患飛蚊症的真正原因,我也會不安,擔心症狀加劇。

「飛蚊症」只是某個或某些疾病的一個「症」,而不是「疾病」本身。一日不能知道,我的飛蚊症的病因,我也不能有力預防,症狀的加劇。

(問:你不是說,長期夜睡少睡,導致你的飛蚊症嗎?)

本文章並(!)不(!)可作為醫學建議。如需專業意見,請諮詢專業人士。

— Me@2019-03-18 04:47:58 PM

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2019.03.18 Monday (c) All rights reserved by ACHK

(反對)開夜車 2.3

Ken Chan 時光機 1.4.2.3

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本文章並(!)(!)可作為醫學建議。如需專業意見,請諮詢專業人士。

結果,他那天只睡了,一個半小時。

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我那時以為,那沒有什麼大不了。但是現在,我也已一把年紀了,才驚覺,只要有一點不幸,那就可以造成,嚴重的後果。

(問:那有什麼「嚴重的後果」?)

「嚴重後果」中,較為輕微的,我也經歷過,而且可以視為「不可逆轉」的。

例如,大前年開始,我左眼患有飛蚊症。即是話,視野中,有一些黑點等,不應存在的小垃圾。

飛蚊症可以視為「不可逆轉」的原因是,以現今科技,醫治飛蚊症方法,風險遠比「良性飛蚊」的症狀本身高。所以,除非一個人的飛蚊症極度嚴重,否則,眼科醫生也不會建議病人,去接受那些手術。

(問:「良性飛蚊」?)

「良性飛蚊」的「良性」,並不是說真的有益,而只是指「不會致盲,只會帶來精神困擾」。

至於「惡性飛蚊」,即是指「有致盲風險」,因為,那代表著,視網膜開始脫落;必須立刻做手術制止之。

(問:如果開始有飛蚊,自己又怎會知道是,「良性」還是「惡性」呢?)

不會知道。

所以:

  • 第一,你要在未有飛蚊時,防範於未然。

  • 第二,萬一仍然出現飛蚊的話,要立刻看眼科醫生,讓他為你檢查,是否視網膜開始脫落。

    • 如果不是,就不用擔心。

    • 如果是,可以立刻做手術,制止視網膜脫落,保住完整的視力。視網膜開始脫落,而不立刻做手術制止之,有致盲的風險。

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至於,我自己的案例,則幸好是良性的,不會致盲;只要飛蚊不惡化,視力不會減弱。

(問:但你剛才說,飛蚊症「會帶來精神困擾」?)

無錯。可以說是心靈創傷。

(問:為什麼呢?)

本文章並(!)(!)可作為醫學建議。如需專業意見,請諮詢專業人士。

— Me@2019-02-25 04:01:37 PM

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2019.02.26 Tuesday (c) All rights reserved by ACHK

(反對)開夜車 2.2

Ken Chan 時光機 1.4.2.2

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The light that burns twice as bright burns half as long, …

— Blade Runner (1982)

可能,因為他「溫習到凌晨」式的方法,對他來說有效,他亦鼓勵學生那樣做。

我現在的記憶,暫時未能確定,他在課堂中,有沒有明示推介過,用這個方法。但是,我記得在他派發的筆記中,其中一頁,有一個正在深夜讀書的漫畫。而在漫畫下面,有一句「study to 3 a.m.」(讀書至深夜三點鐘)。

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長話短說,我是反對這個方法的,理由有很多,例如:

第一,長期睡眠不足,會導致腦袋呆了,大大減低下一天的工作效率。

第二,長期睡眠不足,會導致身體時常病。

在 Ken Chan 的部分課堂,特別是假期的補課中,我就見到他時常咳嗽。可能,他在工作時代,仍然過著,極度忙碌的生活。

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還記得在九月,在課程的第一課,他就已經遲到,遲了大概 15 至 30 分鐘之間。那課原定於早上八時半開始。上課中途,他有點咳嗽。他說,因為當天早上之前,吸入了太多的氮氣。他懷疑一位同事,作弄了他。

話說,他工作的地方,有一部儀器壞了。他的同事跟他說:「部機好似壞咗,漏緊啲 nitrogen 喎,你聞下係唔係?」(那儀器疑似壞了,正在洩漏氮氣。你聞一聞,看看是不是。)

Ken Chan 事後回心一想,才醒起:「Nitrogen 又點會有味咖?」(氮氣又何來會有味道呢?)

結果,他那天只睡了,一個半小時。

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我那時以為,那沒有什麼大不了。但是現在,我也已一把年紀了,才驚覺,只要有一點不幸,那就可以造成,嚴重的後果。

— Me@2019-02-03 07:02:42 AM

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2019.02.03 Sunday (c) All rights reserved by ACHK

(反對)開夜車 2.1

Ken Chan 時光機 1.4.2.1

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之前提到,Ken Chan 所讀的中學不正常:

在中四和中五的校內考試測驗中,不斷地考核高考課程。所以,他在中四時代開始,已經要鑽研,高考程度和大學程度的物理。

那樣,他何來有,那麼多的時間呢?

那時,他往往要讀書,至通宵達旦。

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那樣,他的公開試成績,又如何呢?

根據他所講,他事後發現,會考物理科中的 MC(多項選擇題)部分,錯了兩題;他達不到他原本,「全部科目全部滿分」的理想。

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那樣,他又做不做到「狀元」,全部科目「奪 A」呢?

他在另一天的課堂中,暗示自己當年,差一點才做到「狀元」:

(我暫時不記得,他以下說話的上半句是什麼。)

… 如何不是那樣,我就毋須於,放榜當天的晚上,在家裡哭。唉!還是不說了。

當時,我想知道詳情。可惜,他真的沒有說下去,我也沒有辦法。

雖然,主觀而言,從他自己的角度,成績不是理想,因為,那不是「全部科目全部滿分」;但是,如果不是對自己,那麼苛刻的話,客觀來說,他的成績是上乘的。

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可能,因為他「溫習到凌晨」式的方法,對他來說有效,他亦鼓勵學生那樣做。

我現在的記憶,暫時未能確定,他在課堂中,有沒有明示推介過,用這個方法。但是,我記得在他派發的筆記中,其中一頁,有一個正在深夜讀書的漫畫。而在漫畫下面,有一句「study to 3 a.m.」(讀書至深夜三點鐘)。

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長話短說,我是反對這個方法的,…

— Me@2019-01-18 03:47:50 PM

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2019.01.19 Saturday (c) All rights reserved by ACHK

接觸永恆 2

Publish! 11

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每個人,都需要有作品。

你的作品,就是你的人生意義。

每個人,都依靠自己的作品來生存。

作品,就是一些,不會隨自己的消失而消失的東西。

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你,有沒有自己的作品?

— Me@2011.07.03

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2019.01.13 Sunday (c) All rights reserved by ACHK

Insomnia, 5

mingyeow 47 minutes ago [-]

I had signs of insomnia in the last couple of years. Tried all the usual techniques, and I realized those just do not work for one simple reason – that the moment I do not fall asleep, I become frustrated. And that frustration in turn makes sleeping much harder.

So, I tried doing the exact opposite, and my sleep has been tremendously better since.

Essentially, I force myself to keep my eyes open. When I catch myself falling asleep, I actually force myself to keep them often again. Before I know it, it is morning.

It sounds counter-intuitive, but all my insomnia problems are over, including on a plane. Would love to know if it works for others, or if it is just a silly thing that works for only me.

— Insomnia: To Pursue Sleep So Hard You Become Invigorated by the Chase

— Hacker News

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2018.11.20 Tuesday ACHK

A pretty girl, 2

Women are directly fitted for acting as the nurses and teachers of our early childhood by the fact that they are themselves childish, frivolous and short-sighted; in a word, they are big children all their life long–a kind of intermediate stage between the child and the full-grown man, who is man in the strict sense of the word. See how a girl will fondle a child for days together, dance with it and sing to it; and then think what a man, with the best will in the world, could do if he were put in her place.

— Of Women

— Arthur Schopenhauer

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When the elderly Schopenhauer sat for a sculpture portrait by the Prussian sculptor Elisabet Ney in 1859, he was much impressed by the young woman’s wit and independence, as well as by her skill as a visual artist. After his time with Ney, he told Richard Wagner’s friend Malwida von Meysenbug, “I have not yet spoken my last word about women. I believe that if a woman succeeds in withdrawing from the mass, or rather raising herself above the mass, she grows ceaselessly and more than a man.

— Wikipedia on Arthur Schopenhauer

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Anybody can look at a pretty girl and see a pretty girl. An artist can look at a pretty girl and see the old woman she will become. A better artist can look at an old woman and see the pretty girl that she used to be. But a great artist — a master — and that is what Auguste Rodin was — can look at an old woman, portray her exactly as she is… and force the viewer to see the pretty girl she used to be…. and more than that, he can make anyone with the sensitivity of an armadillo, or even you, see that this lovely young girl is still alive, not old and ugly at all, but simply prisoned inside her ruined body. He can make you feel the quiet, endless tragedy that there was never a girl born who ever grew older than eighteen in her heart…. no matter what the merciless hours have done to her. Look at her, Ben. Growing old doesn’t matter to you and me; we were never meant to be admired — but it does to them. Look at her! (UC)

— Robert A. Heinlein

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2018.10.27 Saturday ACHK

Insomnia

如夢初醒 4.2 | 讀書與睡眠 4.2

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DrPhish 5 months ago [-]

This is exactly the Zen moment that fixed my lifelong insomnia: lying in bed relaxed with my eyes closed, even if I’m not asleep, leaves me feeling worlds better in the morning than fretting about not being able to sleep. It’s something that happened when I forgot about it completely. Once I realized I could literally just lie in bed for 8 hours and be OK, I was able to let go.

It’s like a trap that closes tighter about you the more you struggle, and releases if you allow yourself to relax[.]

Once I really got that, sleep became regular and uninterrupted[.]

laumars 5 months ago [-]

I discovered this recently too. Even in the instances when I still don’t get to sleep (eg my 1 year old coming into bed and wriggling in her sleep waking me) I’ve still felt more refreshed when I’ve relaxed rather than laid in bed wound up. I’m not into new age / whatever stuff but I like to think of it as night time meditation as while it’s still not as good as sleep it’s still a great deal better than full blown insomnia! And best of all, sometimes it clears your mind enough to actually sleep.

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— Thinking of yourself as an insomniac may be a part of the problem

— Hacker News

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2018.10.11 Thursday ACHK

Illusions destroyed, 2

Ask HN: Why is nearing completion so demotivating?

534 points by danschumann 3 months ago

So I’ve been working on animation software for over two years. Part of me is very excited for launch so I can have money again (I’ve been freelancing a minimum amount these last two years, and went car-less, moved, cut lifestyle into a third). I should be wholeheartedly excited, but I’m feeling tired and generally sluggish regarding the project. I still make consistent progress, but it takes a lot of will power.

Part of me thinks it might be an aversion to sales. Part of me thinks this could have been built up so much in my head that anything short of overnight millions would be a disappointment (though I would be happy with 1500 bucks a month), part of me thinks I might be scared of success (or scared of surpassing my parents) (media attention), part of me fears the attacks that might come with success (having something to lose), part of it is the un-fun-ness of mature projects where the focus is on polish and bugs rather than broad new features, and part of me is scared of commitment: if I succeed I have to stick with this (freedom value), part of me wonders what will happen when more people become involved, if I will be able to maintain my creative direction, since I’m scratching my own itch. Part of me wonders if diet and exercise isn’t a factor.

A combination, likely…

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mikekchar 3 months ago [-]

When your project is finished, the dream is dead and the reality is born. The death of a dream is like the death of a friend. It’s probably been with you for a long time — longer even than the length of the project. A dream is the manifestation of what’s possible. When it is over, the possible diminishes very quickly and you are left with what actually is. Will people respond well to your project — in the dream stage it is possible; everything is possible. In the reality stage, it will only be what it is.

So while it’s common to think of a release as a birth of something new, realise that you also have a significant loss. You will mourn that loss. Give yourself some emotional space to deal with the mourning.

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riantogo 3 months ago [-]

This is exactly it. Tens of my personal projects have died in this stage. It was always much easier to move on to the next dream. There is always the next big problem that could use a solution. Why not build when it is what we do best? Rinse, repeat.

I took a break from side projects for several years but recently got back to it and couple weeks back finished building. It is the same story all over again. Same feeling. I’m dreading what comes next.

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— Why is nearing completion so demotivating?

— Hacker News

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2018.09.01 Saturday ACHK

Mirror selves, 5.2

Anatta 3.3 | 無我 3.3

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You fight for existence, for being alive.

However, your existence is not “yours”.

The existence of you, is not your property.

The existence of you, is a property of the group you are in.

The existence of you, is a property of other people.

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To meaningfully say the statement “I exist”, you have to specify you exist with respect to whom.

To exist, you have to specify to exist in which people’s world.

— Me@2018-05-22 7:43 AM

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2018.07.02 Monday (c) All rights reserved by ACHK

Plato

trowawee 4 months ago

I’m a little frustrated at the tossed-off reference to Plato and Aristotle at the beginning – “The good life may have sufficed for Plato and Aristotle, but it is no longer enough.” – because I feel like that ignores the fact that both Plato and Aristotle, along with a lot of philosophers, actually had a lot to say about physical fitness. Plato was a champion wrestler, and both he and Aristotle viewed physical education as a fundamental component to living the good life. Xenophon quotes Socrates saying this:

“For in everything that men do the body is useful; and in all uses of the body it is of great importance to be in as high a state of physical efficiency as possible. Why, even in the process of thinking, in which the use of the body seems to be reduced to a minimum, it is matter of common knowledge that grave mistakes may often be traced to bad health.”

The whole article feels a little too mired in presentism, and ignorant of the history of self-improvement ideas.

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coldtea 4 months ago

>Plato was a champion wrestler

And the name Plato is a nickname — meaning “the broad/wide one” given to him for his broad shoulders because of that training and physical appearance. Real name: Aristocles.

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kernelbandwidth 4 months ago

It’s funny to consider that one of the canonically great philosophers in history is known essentially by the equivalent of his WWE wrestling name. It’s like if in the future there were classes taught on the philosophical ideas of “The Rock”.

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coldtea 4 months ago

Some other amusing related stuff: so, Plato, was called for for the ancient greek word for broad/wide.

Modern [English] words that stem from the same root: plateau, platitude, plat, plate — via French and Latin (plattus) from Greek (platis “flat, wide, broad”).

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danohu 4 months ago

Well, the first Pope was literally called The Rock (Peter). Jesus appointed him by saying “you are The Rock, and I’ll build my church on this rock”.

Exactly what he meant has led to centuries of debate between protestants and catholics.

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acangiano 4 months ago

“No man has the right to be an amateur in the matter of physical training. It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable.”

― Socrates

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— Improving Ourselves to Death

— Hacker News

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2018.06.01 Friday ACHK

Life, 3

生命 3

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We exist in time because time is change.

Growing is part of the definition of life. Growing is a kind of change.

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Also, without time/change, there would be no thinking and no thoughts.

— Me@2017-12-26 11:42 am

— Me@2018-05-23 10:05:03 PM

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time ~ change

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Time is logically necessary if change is necessary.

— Me@2018-02-04 09:07:48 PM

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2018.05.23 Wednesday (c) All rights reserved by ACHK

Sleep apnea

erentz 3 months ago

Slightly tangential to the study here but I’ve been going down the sleep apnea rabbit hole in recent months and I strongly encourage folks to investigate their sleep. A lot of people have sleep apnea and don’t realize it. You don’t have to snore to have it. A surprising statistic I found was 20-30% of people with ADHD have sleep apnea. A lot of people may be treating symptoms of sleep apnea like ADHD and high blood pressure with medications while ignoring the root cause. My experience with this has been that doctors are surprisingly ignorant. They’ll happy prescribe you medications for anxiety, ADHD, blood pressure for years, and never think to ask you about your sleep. Do some of your own investigations or ask about it if you have any suspicions.

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copperx 3 months ago

I’m going to add myself as a data point. After suffering years of feeling sleepy regardless of how much I slept and frequently unmotivated and withdrawn, I was diagnosed with severe sleep apnea. A few years ago I was given Dexedrine, Ritalin, Adderall, and I even tried self-medicating with modafinil to ameliorate the symptoms of what doctors thought was ADHD with varying levels of success; but the drug-free treatment of sleep apnea with a BiPAP machine got rid of all of these issues; in addition, I feel about ten years younger.

— Sleep and Mortality: A Population-Based 22-Year Follow-Up Study (2007)

— Hacker News

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2018.05.09 Wednesday ACHK

技術細節 3

親歷其境 3

這段改編自 2010 年 4 月 18 日的對話。

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一切文學,余愛以血書者。

— 尼采

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剛才講到,我想去升學那間大學的物理系,其獨特優秀之處。

世界上,只有極少數大學,提供超弦理論的課程。而且,那個碩士課程,不是純修課式。它為期兩年:第一年是上課,第二年是研究。

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對於我現在這個年紀,單純知識的吸收(簡稱「學習」),沒有大意義。對我有大意義的是,研究和製造。

或者說,即使一個人對學術有極大興趣,十分喜歡學習,都不應做「永恆學生」。「永恆學生」在這裡,作負面意思用。「永恆學生」的特徵是,知識多而能力差,簡稱「高分低能」。

留意,所謂「知識多而能力差」,其實就即是,知識流於表面,未詳細到可以應用。例如,即使你對中國象棋中的每一隻,行走的方法,非常熟悉,那並不代表,你「懂」怎樣下棋。

要真正下到棋,你要靠不斷嘗試,長期的實戰。那樣,你才可以獲得下一個層次的知識;令自己對於象棋,知得足夠詳細,詳細到足以有效實行。

有時,知易行難,是因為知得不夠深入;

有時,行而無效,是因為行得不夠徹底。

永久單純地,吸收新知識,而沒有下一個層次的發展,是沒有意義的。或者說,知識上,只有輸入而沒有輸出,是病態。

所謂「下一個層次的發展」,可以是:

1. 應用

隨著越來越多次的應用,你於該個領域的知識,再不是依書直說,而是真才實學。

2. 傳播

如果你要傳播知識,必須靠說話或文章。

無論用兩者的哪一個,你必須透過自己的「語言」。換句話說,你必須為舊知識,創造一個新的包裝;即使,有時,你是不自覺地那樣做,未必意識到自己正在從是創作。

還有,有時,你亦會無意中,有知識上的新發現—在為舊知識創造新包裝時,竟然引發了新知識。

3. 研究

透過舊知識,發掘新知識。

— Me@2018-05-05 10:06:15 AM

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Know the subject—At the Dale Carnegie public speaking class, which I highly recommend—they say anyone can make a good speech if he or she has _earned the right_ to speak on the subject in question. How do you earn the right? By living through the subject or by doing extensive research on it—which is arguably another form of living through it. Same principle applies to how-to writing. You cannot do high school student research. That is, find 21 facts and write an essay that consists solely of those 21 facts. Rather you need the proverbial iceberg of unused facts under the “tip” that is your book. The good news is virtually everyone has lived through something that fits that criterion. And, with a year or so, we can all research something that interest us to the point where we can write about it. The key to bad writing is assigned topics—the standard of high school and college teachers.

— John T. Reed

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2018.05.06 Sunday (c) All rights reserved by ACHK

The Sixth Sense, 3

Mirror selves, 2 | Anatta 3.2 | 無我 3.2

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You cannot feel your own existence or non-existence. You can feel the existence or non-existence of (such as) your hair, your hands, etc.

But you cannot feel the existence or non-existence of _you_.

— Me@2018-03-17 5:12 PM

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Only OTHER people or beings can feel your existence or non-existence.

— Me@2018-04-30 11:29:08 AM

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2018.04.30 Monday (c) All rights reserved by ACHK

Almost nothing new

The most valuable insights are both general and surprising. F = ma for example. But general and surprising is a hard combination to achieve. That territory tends to be picked clean, precisely because those insights are so valuable.

Because these start out so general, you only need a small delta of novelty to produce a useful insight.

A small delta of novelty is all you’ll be able to get most of the time. Which means if you take this route your ideas will seem a lot like ones that already exist. Sometimes you’ll find you’ve merely rediscovered an idea that did already exist. But don’t be discouraged. Remember the huge multiplier that kicks in when you do manage to think of something even a little new.

It’s not true that there’s nothing new under the sun. There are some domains where there’s almost nothing new. But there’s a big difference between nothing and almost nothing, when it’s multiplied by the area under the sun.

— General and Surprising

— Paul Graham

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2018.04.22 Sunday ACHK

Eyes on me

dziungles 14 days ago

Hey, this is really cool to see natural eyesight topic on the hacker news.
I practice this for more than 10 years. Each day I work with computer for ~10 h., drive a car and do other things, and never wear glasses, even though the traditional ophtalmologic measures clearly indicate that I need strong glasses and I shouldn’t see even the biggest letter on the Snellen chart, but I see not only the biggest, but sometimes even the 20/20.

Doctors can’t explain this, and only congrats me on my achievement. Of course, the eyesight is not perfect. I see clearly in the daytime, but in the nighttime or low light conditions it becomes much harder to distinguish faces.

The best book I found so far is “Relearning to See” by Thomas R. Quackenbush. The originator of this theory was William Bates.

Actually, there is no clear unified theory on how to achieve this. Everyone interprets it differently and the results are inconsistent. There is also a lot of criticism from the medical establishment.

Natural eyesight improvement really works. And the unified theory, in a form of an app, or a good book, maybe including findings from neuroplasticity, would be a great gift for humanity.

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bsder 14 days ago

Natural eyesight improvement really works. And the unified theory, in a form of an app, or a good book, maybe including findings from neuroplasticity, would be a great gift for humanity.

It SORT OF works in stable and predictable situations.

What seems to be happening is that your brain, in all of its neuroplastic glory, is learning to make better inferences from the broken information it receives.

The issue is that this works as long as the inferences are correct. That’s fine when you are reading a newspaper, using the computer, etc. as the situation is stable and predictable.

The problem is that when you are suddenly confronted by a situation where the inferences are NOT correct–such as a nighttime emergency situation while driving. Now you are relying on the “uninferenced” data coming in from your eyes and that data is subpar with all the resultant problems.

The best solution is both: fix the data coming in with corrective lenses for unpredictable situations, and train your brain to make better inferences so you can deal with predictable situations better.

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dziungles 14 days ago

Before, I also had this theory in my mind for a year or so.
But for example, right now I’m in Thailand, traveling here for the first time. Everything is new, unfamiliar and unpredictable, daytime, nightime. I have no problems seeing things, everything is almost perfectly clear and sharp. I needed some time to adapt to a smaller screen of my laptop (I was using 24 inch before), but now I’m doing fine.

Actually, the more you look, the better you see. Like in Aaron Swartz blog post, if you want to retrain your weak legs, you need to walk more. Same with eyes.

https://web.archive.org/web/20180204094207/https://news.ycombinator.com/item?id=16194580

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2018.02.09 Friday ACHK