Discover and read the best of Twitter Threads about #Til

Most recents (24)

zionlights.substack.com/p/everything-i… #TIL

Everything I believed about nuclear waste was wrong

昔日的反核电斗士幡然醒悟,意识到核能其实是最安全最环保的能源。
全球因石油化工污染而损失的寿命。看上去印度和中国是重灾区。

中国人还天天嘲笑日本那微乎其微的核辐射,也不看看大气污染导致的寿命减少比日本最严重的辐射区还要恐怖…
核电产业的核废料其实很少,绝大部分是低危害的低辐射废物,核电的废物辐射量要低于普通化工废料的一千倍才会被视为普通废物。
如日、法等回收核废料的国家,对核燃料的利用率高达 96%。全世界的高危核废料堆在一起,只够放满一个足球场,高度大概 9 米。这些废料的辐射在 40 年后就会衰减为千分之一。
Read 7 tweets
ssltrust.com/blog/understan… #TIL
cross-signing x.509 certificate Image
letsencrypt.org/certificates/

letsencrypt 也提到自己更换了 root CA,但是使用了 cross-sign 来保证其签发的 leaf cert 的兼容性。
x.509 证书通过非对称签名的信任链(certification path)来证明 leaf cert 的可信性,即递归地使用上一级证书的公钥来校验当前证书的签名。

所以,任何一个非 root ca 证书,其实可以有任意多个可证明自己的上游证书,只要这些上游证书都具有相同的公钥。
Read 7 tweets
#googlelayoffs ended an amazing 18 years at Google. Honored they hired me all those years ago, grateful for the amazing people I worked with. If I could go back in time 18 years, I would absolutely join Google again. Where else could I and not get fired?
I've always enjoyed coding and I'd do it for free... ironically #googlelayoffs severance for an 18-year veteran of Google is a year of salary and stock vesting, during which time they'll block me from coming in.
Also, I'm an optimization guy... and we just finished the yearly review process... #TIL that documenting that your tweaks save millions of dollars worth of data-center costs each year... won't prevent you from being laid off in the name of cost-cutting.
Read 3 tweets
nature.com/articles/s4157… #TIL 关于长新冠的研究
约有 10% 的新冠患者会出现长新冠症状,部分症状可能伴随终身,这导致了目前面临的劳动力短缺。

西班牙裔、拉丁裔、患病后无法充分休息的人更可能遭受长新冠(留下贫穷的泪水😢)。
长新冠导致的认知障碍(脑雾)风险随时间推移而增加,至少持续两年以上(目前只有两年数据)。
Read 5 tweets
bloomberg.com/news/articles/…

Just listened to this podcast w/ @IsabellaMWeber and it was enlightening, thought provoking, & humbling for many reasons.

Like most people, I only know a tiny bit of economics and generally dislike price controls. 🧵
I know a little of a lot of things, I also know a lot about very few things & suffer from the same bias many folks do; that I think I know more than I do. Listening to this interview was a good reminder that there are folks much smarter & more knowledgeable that are true experts.
It was the first time (to me) price controls was discussed & presented in a way that seems compelling/necessary given the circumstances. i.e. supply constraints that cannot be (quickly) solved by price competition can lead to exploitation/profiteering.

de.wikipedia.org/wiki/Isabella_…
Read 6 tweets
#TIL - Punit Renjen, now CEO of Deloitte, had to drop out of a school because his parents couldn't afford the school fees.

Graduated from a local college in Rohtak because it was cheap.

Went to Delhi to find jobs based upon an advert for Usha that he saw in a newspaper.
And then he got a 'Rotary Scholarship'.

Yes - the same 'Rotary Club' which organizes small cultural events. At least it used to when I was a kid in Bharatpur.

He seized that opportunity and made the most of it.
The first time he sat on a flight was when he went to the USA for his masters from the scholarship.

He landed there with two pair of tight jeans and couple of hundred dollars. (His quote - I am not making it up.)
Read 10 tweets
#TIL

Linux 实际上只管理了机器上的一小部分硬件,还有大量的协处理器在各自为政。我们需要新的、真正的操作系统,把整个机器统一管理起来。
因为各种原因,linux 在全面接管系统这件事上完全失败。它将自己定义为一个高度抽象的专职系统,各个硬件不得不依赖自行设计的协处理器隐藏起底层细节。
linux 继续假装掌控整个系统,但其实同一机器上运行着很多个异构系统,他们有不同的物理地址,有不同的操作权限,而且往往闭源,成为安全隐患
Linux 事实上已经被逼到了一个小角落,假装自己仍然掌控全局。
一个很有趣的例子就是主板芯片 BMC,这其中也跑着一个小型操作系统,而此时 CPU 可能还没开始供电。
Read 7 tweets
#TIL agricultural workers in South India, who typically spent 4-5 hours in the open with >30% of their skin exposed were found to be deficient in Vitamin D!

doi: 10.1093/ajcn/85.4.1062

Since no other factors seem to be at play, I presume timing of sunlight exposure is to blame.
The same study (from 2007) on around 1200 individuals found >80% rural and >90% urban people had deficient/insufficient Vitamin D. I suppose the situation is even more alarming now, especially in urban India

This is truly scary as Vitamin D not only promotes calcium absorption..
..and keeps bones healthy but has "been linked to improving immunity, tiredness and muscle weakness, bone pain, depression...[and has] also been said to help stave off cancer and the consequences of ageing," diabetes, cholesterol and now, even anaemia bbc.com/future/article…
Read 13 tweets
A random selection of what I've watched on YouTube tonight. People complain that it's all trash but I just don't get it. 🤷🏻‍♀️
Altai throat singing. Bai Terek

One of these guys is an MMA fighter. 😲

tapology.com/fightcenter/fi…

"Ka Ipo Lei Manu" by Sean Na'auao, a Native Hawaiian Slack Key guitarist & vocalist.

hawaiinewsnow.com/2019/12/03/fat…

Read 10 tweets
#Til #எள்ளு Black sesame seeds have the powers to absorb negative energies that are present both in the atmosphere and inside the body. Therefore, black sesame seeds are used for cleansing the surroundings during tarpanam and Sradham. By using the kala til or black sesame seeds
people invoke their dead ancestors who wander in the Pitru Loka, a zone between earth and heaven. People offer black sesame seeds with water to the Pitrus while chanting specific mantras. These mantras (sounds) have certain energies that, in turn, activate the sesame seeds to
start attracting the dead relatives to earth for accepting the Pinda daanam or our offerings. The ritual is done to relieve the ancestors from the vicious cycle of birth and death and also help them in getting liberated from worldly desires that keep troubling their souls. A
Read 4 tweets
#TIL that Shammi Kapoor was one of the first users of the Internet in India

He was the founder & chairman of the Internet Users Club of India. I can't wrap my head around how someone like Shammi Kapoor was in the thick of the internet movement in India?

I did some digging 👇
I found this dead website mafatlal.co.in on the Internet Archive. It was one of the first domains with a ".co.in" TLD.

It was owned by this guy: Miheer Mafatlal and it hosted the IUCI webpage. As tech people stereotypes go, he sure does look the part.
This is how one of India's first independent and private websites looked like.

It couldn't have a more 90s internet aesthetic if it tried. Love it!
Read 12 tweets
#TIL

How much time will you spend in meetings in your work time?

- 20% to 40% says cultureamp.com
- It will be 4 years in a person's whole life

There is 4P Method to help you master your meetings.

✓Purpose
✓Product
✓Personal Benefit
✓Process
From their research, they found a few interesting percentages.
- Believes meeting are #1 waste of time (49%)
- Admits to deliberately missing meetings (96%)
- Daydreams in meetings (91%)
- Does other work (73%)
- Sleeps in meetings (39%)
Read 7 tweets
Haven’t we had enough planning scandals?
irishexaminer.com/opinion/commen…
‘It is difficult to escape the conclusion that the amendments are being rushed through to avoid controversy, negative media coverage, and the requirement to actually explain what is at issue.”
- @Mickcliff

‘Again.’
- Me
“On Thurs. evening opposition politicians were given details of 48 pages to be added to a 20-page planning bill.
2.5 hours have been set aside on Wednesday to debate these along with amendments from the original bill. It will be impossible for proper Dáil scrutiny to be applied.’
Read 87 tweets
#TIL that there's a 22-mile long race in Wales called “Man v Horse” that, as its name suggests, has both humans and equine participants (well, with riders). And sometimes, albeit rarely, a (non-rider) human wins, like this year. bbc.com/news/uk-wales-…
Me, I'm waiting for the “Man v Sloth” race so I can finally have a chance to compete with like mammals.
Read 4 tweets
Salah satu fragmen sejarah Majapahit, Prasasti Balawi, berangka tahun 1227 Śaka (24 Mei 1305 M.) dikeluarkan raja Majapahit yang pertama, Çrĩ Kṛtarãjasa Jayawarddhana, tentang pengukuhan tanah di Balawi sebagai sima swatantra dengan tinaṇḍa pãlaga triçũlamukha Image
Status tanah perdikan Balawi sebenarnya telah diberikan oleh Çri Harśawijaya ketika menjadi penguasa bhūmi Janggala, tetapi baru dikukuhkan dengan tamra prasasti oleh anaknya, Narāryya Sanggramawijaya, melalui permohonan warga kepada sang wirapati pu kapat #TIL
Prasasti Balawi terdiri dari 6 lempeng (I, II, IV, VI, VII, VIII) sayangnya lempeng yang cukup penting (V) tidak ada, padahal lempeng ini bisa jadi menceritakan awal penetapan status perdikan Balawi oleh Çri Harśawijaya.

Hayo, siapa yang sedang menguasai fragmen sejarah ini?!
Read 6 tweets
how to grow a community on twitter
pick a theme and state it directly or indirectly in your bio. mine is, startups & vc for first-time founders
post consistently. there’s a difference sweet spot for everyone depending on where you’re located, but generally it’s 11am. post daily.
Read 12 tweets
“Josh Allen listening? Can people get this message to him? Vi-a-gra. Take a viagra before the game, baby.”
— Bart Scott

Added: “A lot of NFL players, at least in my day, took viagra.”

Mark this all under #TIL
Everyone’s reactions to this entire Bart Scott / viagra aside were hysterical. Damien Woody was LOSING it 😂😂😂

And it kind of made me view everything Louis Riddick said afterward in a goofy, double entendre, “that’s what she said” way too.
This seems like it might be about to go off a little bit... plus there's rarely a bad time to try to plug @LAvsAllYall.

So, you know, check it out, hit subscribe, etc. 🙏🙏

youtube.com/channel/UCSeB0…
Read 4 tweets
#TIL about OSINT (open source intelligence, the process of gathering information utilizing public resources) & I’m like wait a min, I’ve been doing this for FUN since I was a kid and there’s whole methodologies and techniques? It’s never too late to learn and expand your skillset
I always thought I was weird bc I’ll just randomly go on deep dives and find more information about a person or case. I’ll have barely one or 2 clues or pieces of information about something & investigate. That’s what I did for a lot of missing person cases for instance.
Infosec is so fire y’all. Deadass.
Read 4 tweets
#TIL that engineers had issues with the honeycomb insulation on the #SaturnV second stage, so they ended up hiring local surfers from #SealBeach CA, who had experience in working with the material, to apply it to the vehicle 🚀🏄 @NASAhistory
The challenging area was the Stage Two (S-II) common bulkhead on #SaturnV, where the LH2 and LO2 tanks shared a common interface (see center of image)
In #SaturnV's early days, #NorthAmericanAviation engineers attempted to adhere the insulation to the LH2 tanks in large vacuum chambers, so the insulation would be sucked down onto the adhesive coated metal. However, the team had problems with the insulation popping off the tank.
Read 13 tweets
🔴🔵 HERE WE GO‼️

Terima panggilan kecemasan dari Emak di kampung.

🚔 Pegawai Special Branch datang ke rumah untuk soal siasat adik aku yang kibar 🏴

MORE TO COME 🔜
UPDATE ‼️

CONFIRMED 🔥

Ada macai pergi buat report ke Balai Polis Tronoh. Pegawai datang tapi NFA.

Macai tak puas hati, report ke IPD Batu Gajah. Terus SB datang melawat ke rumah pula.

MORE TO COME 🔜
UPDATE ‼️

Rupanya adik aku kibar panji Rasulullah kat rumah.

Tapi sebab kaler hitam/putih, terus ada macai PN menggelupur.

Nasib baik polis Tronoh dan SB Batu Gajah YG datang tu kawan dia. Kes settle, dinasihat untuk turunkan bendera supaya macai PN puas hati.

HERE WE GO ‼️
Read 5 tweets
#TIL Syed Jaafar Albar, a Malay Ultra, came from Makassar just like Najib Razak's ancestors. He came to Singapore as an immigrant when he was 14.
The Malay Ultras of 1960s:
1) Dr Mahathir Mohamed - Indian descent
2) Syed Jaafar Albar - Indonesian descent
3) Syed Nasir bin Syed Ismail - Yemeni descent
4) Musa Hitam - Javanese and Chinese descent.
😁
Not really sure about the family of Syed Nasir but the rest of the Ultras and their families ended up extremely Rich including many in billionaires' list.
Read 5 tweets
"There are 3 kinds of truths in our world today.
1. Objective truth
2. Personal truth
3. Political truth "

Neil deGrasse Tyson
American astrophysicist

#TIL
#FoodForThought
1. Objective truth
This is what is proved by science. Whether you believe it or not it is scientific fact. It has faced numerous testing, experiments & has been proved to be true by multiple people across the world using different methods & materials yet coming to same result.
Government policies should ONLY be made as per objective truths. No place for pseudoscientific mumbo jumbo. We go where the science takes us. Where the evidence takes us.
Read 7 tweets
With one day for the dust to settle, here are my thoughts on some of the #ASCO21 #melanoma data.
1) It is interesting to me that no adj PD-1 melanoma study has yet shown OS benefit vs comparator arm (CM238 - nivo vs ipi, S1404 - pembro vs HDI or ipi, KN054- pembro vs placebo).
Is this because more time in f/u is needed to see diffs emerge? Or does it suggest that PD-1 is equally effective regardless of disease setting (adj vs metastatic) and that enough pts with metastatic melanoma have durable long-term control on PD-1 to explain lack of OS benefit?
I suspect that PD-1 does cure some melanoma pts in the adjuvant setting. But are these the same pts that would have been cured in the metastatic setting? Not easy to answer but longer f/u of these three pivotal studies will be very important.
Read 11 tweets
28 April 1945.

#OnThisDay 76 years ago, Fascist Dictator of Italy Benito Mussolini along with his mistress Clara Petacci were lynched by Communist partisans.

The bodies were later hung upside down in a square at Milan. Image
Adolf Hitler was so disturbed at the news of how his friend met his end, made sure he would be spared this indignity after death.

Just 2 days later, Soviet troops had surrounded the Fuhrerbunker in Berlin.

Hitler committed suicide and gave orders for his body to be burnt.
#Mussolini came to power in 1922. Within 6 years, he had turned Italy into a one-party Fascist state.

Mussolini was a bumbling fool with a talent for oratory. But Italy had a slavish media that turned his every failure(Invasion of France and Greece) into a MASTERSTROKE! Image
Read 15 tweets

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