In this video by QuantumBoffin, an experiment demonstrates the total internal reflection of light inside a glass block. An angular scale is used to measure the critical angle and determine the refractive index of the glass [full video: ] , page 278

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In this video by QuantumBoffin, an experiment demonstrates the total internal reflection of light inside a glass block. An angular scale is used to measure the critical angle and determine the refractive index of the glass

[full video: ]
有趣
( buff.ly )

2年前由 Massimo 提交

1周内 1个月内 1年内全部时间

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Day one of visa-free entry:
A Chinese tourist gets detained and interrogated by Russian police. No crime. Just “routine.”
Today he’s back in China and finally told the full story.
What’s interesting aren’t even the politics — it’s the logic.
They said he was abusing a residence
时政
( twitter.com)

3个月前 • The Great Translation Movement 大翻译运动 0 评论

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Chinese state media and PLA accounts have circulated drone footage claiming to show a close view of Taipei 101, a prominent building in Taipei’s skyline.
It is unclear how close the PLA drone was to Taipei itself, or whether the footage was actually taken by a drone.
时政
( twitter.com)

2个月前 • Taiwan Security Monitor • 下载视频 0 评论

00:00:04

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🇭🇰🇨🇳 | 20-Jan-2026
In one of the most non-self-conscious posts recently by a HK civil servant, the now-head of GovHK’s Tianjin Liaison Office, Bryan Cheng, posted twice on his now-deleted public Threads account about travel & hotel “upgrades” he received.
时政
( www.hk01.com)

2个月前 • Brandon 0 评论

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Chinese female SWAT just smoked the U.S. men’s team by 17 seconds in the 120kg tire assault challenge at UAE SWAT 2025, pure strength, precision, girlboss energy on full display.
But rewind the camera: the same elite units (People’s Armed Police special police) are the frontline
时政
( twitter.com)

1个月前 • The Great Translation Movement 大翻译运动 • 下载视频 0 评论

00:00:32

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Population in 2100, as projected by UN Population Division.
🇮🇳 India: 1,533 million
🇨🇳 China: 771 million
🇳🇬 Nigeria: 546 million
🇵🇰 Pakistan: 487 million
🇨🇩 Congo: 431 million
🇺🇸 US: 394 million
🇪🇹 Ethiopia: 323 million
🇮🇩 Indonesia: 297 million
🇹🇿 Tanzania: 244 million
🇪🇬
时政
( twitter.com)

1年前 • The Spectator Index 0 评论

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Marjorie Taylor Greene's pro-Putin stance isn't popular in North Georgia, but she's being wildly praised by Russian state TV while trashing the United States.
MTG is betraying our country. As someone who fought for our nation, I'm beyond words.
So much for being America first.
时政
( twitter.com)

1年前 • Shawn Harris • 下载视频 0 评论

00:01:25

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BREAKING: New Documents have been released by the FBI in the Trump Mar-a-lago documents case, and things do not look good for Trump…
- The full classification of the documents have been released, which included dozens of secret and top secret documents related to meetings with
时政
( twitter.com)

1年前 • Brian Krassenstein • 下载视频 0 评论

00:00:10

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Microsoft has been training China's top AI developers for years at Microsoft Research Asia, its Beijing laboratory.
Microsoft alumni have gone on to found or play a key part in AI vompanies that are now sanctioned by the US government for collaborating with China's military and…
时政
( twitter.com)

1年前 • Geoffrey Cain 0 评论

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🕯️六四三五｜毋忘天安門屠城
Tiananmen Massacre Candlelight Vigil
Last night, DC4HK & members of the DMV area Hong Kong community attended the annual #June4th Candlelight Vigil hosted by in commemoration of the 35th anniversary of the 1989 Tiananmen Massacre.
时政
( twitter.com)

1年前 • DC4HK - Washingtonians Supporting Hong Kong 😷 0 评论

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“Grok is a word from a Heinlein novel, Stranger in a Strange Land. It's used by a guy who's raised on Mars.
The word ‘grok’ is to fully and profoundly understand something. That's what the word ‘grok’ means to Fully and profoundly understand something.”
-Elon Musk
btc
( twitter.com)

1年前 • SMX 🇺🇸 • 下载视频 0 评论

00:00:23

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🇮🇹 Italian PM Giorgia Meloni:
“The Left predicted that I would destroy Italy, but they were wrong. Employment is at a Record High, our Economy is Growing, Illegal Immigration has decreased by 60%, and we are expanding freedom in every aspect of Italians’ lives.”
🔥🔥🔥
btc
( twitter.com)

1年前 • Cillian • 下载视频 0 评论

00:00:50

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This was almost me. In 2021, I was on the Blue Line when a man dressed in all-black and a shiesty mask walked between the train cars, reached into his backpack, and put a handgun to my head. He didn't rob me, he watched me begin to cry, laughed, then went to the next car. I
btc
( twitter.com)

6个月前 • Stephen Kleinschmit, Ph.D. 0 评论

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The CCP Narratives are on full display and under brutal scrutiny in this interview of one of China’s main spokespersons (Deng Xiaoping’s English interpreter no less). In English with Chinese captions.
Kudos to Al Jazeera.
半岛电视台激辩中共代言人高志凯。大外宣受到挑战。
时政
( twitter.com)

1年前 • MilesYu 余茂春 • 下载视频 0 评论

00:30:12

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This mother was wondering why you need to pay tax in Japan and how it affect her daughter VISA status.
We are also wondering if she is working in Japan and how she get her income. Maybe she can shed some light on how she get her income or how she support herself it will become
时政
( twitter.com)

5个月前 • The Great Translation Movement 大翻译运动 • 下载视频 0 评论

00:00:40

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"Today, I am holding up an image that shows many current political prisoners in China. My heart aches terribly every time I see this picture. But I put it on my desk at home and I look at it every day...I know I must let the world know about the human rights abuses in China.”
时政
( twitter.com)

2年前 • China Commission • 下载视频 0 评论

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BARBIE (IN CINEMAS)
This was always to going to be a "Tight arse Tuesday" event for me. It tried to hit home with a deep message but gets itself in a massive muddle and ends up a hot mess. 3/10 mainly for the ultimate perve fest that is Margot Robbie ,which sadly will make some…
时政
( twitter.com)

2年前 • Tony Locantro 0 评论

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LaVonte Dell was recently pulled over, writing on his Facebook page:
"Yesterday I was pulled over in Westland for my window tint.
This stop was nothing like I thought it would be. He got my s—t and was walking back to the car and seen my daughter wasn’t in a car seat. So he asked…
有趣
( twitter.com)

2年前 • Epoch Inspired 0 评论

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Adorable dog celebrates a bit too soon

"In a beginner obedience competition, Molly was supposed to sit/stay and wait for me to call her to me. Then she was to sit in front of me and look up. This is the last exercise of the event and Molly decided to celebrate early. We lost a…
有趣
( twitter.com)

2年前 • Epoch Animal Lovers • 下载视频 0 评论

00:00:39

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I read through all 600,000 lines of code in the new X Algorithm
It took me 13 hours to do it. Let me save you that time.
Here’s the top 9 things you need to know in order to succeed on X:
1. Time on content is the most important engagement metric on X. This is why Articles
时政
( twitter.com)

2个月前 • Alex Finn 0 评论

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As of today, Russia is not acting as an ally of Iran. Perhaps it would like to, but we have already seen it with Syria, and now we see it with Iran – I believe they simply do not have the capacity for this. All their forces are either buried in Ukrainian soil or engaged in the
时政
( twitter.com)

17天前 • Volodymyr Zelenskyy / Володимир Зеленський 0 评论

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Everything Trump and Musk are doing is exactly what people voted for in November.
Democrats can’t comprehend this.
They were completely rebuked at the ballot box but they can’t see it.
Their narcissism won’t let them.
btc
( twitter.com)

1年前 • Mostly Peaceful Memes 0 评论

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Trump at 53% approval in poll this morning because he’s getting on the right side of virtually every issue, and vast majority think he’s fulfilling his promises. My take on today. He’s the 80/20 president.
btc
( twitter.com)

1年前 • Scott Jennings • 下载视频 0 评论

00:00:31

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The Maastricht Treaty, signed on this day in 1992, made the European Union possible, led to the introduction of the euro and created EU citizenship.
It also meant additional powers for the European Parliament.
Read more:
时政
( europa.eu)

1年前 • European Parliament 0 评论

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The future is autonomous & it starts in Austin, this June
Thanks to Austin City & Texas DOT for hosting & supporting our efforts to unlock safe & low-cost premium point-to-point electric transport
btc
( twitter.com)

1年前 • Tesla 0 评论

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Elon and DOGE team interview on Fox is eye opening. All Americans should be cheering them on and hoping they succeed in their mission to make government more efficient. This should not be a partisan issue.
btc
( twitter.com)

11个月前 • Lex Fridman 0 评论