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 244

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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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For many decades, the federal Department of Education has failed our students, families, and teachers.
Education is best administered by parents and teachers and those closest to students, not bureaucrats in Washington, DC.
President Trump is keeping his promise and returning
btc
( twitter.com)

1年前 • Speaker Mike Johnson 0 评论

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100 MW / 200 MWh of Megapacks have been delivered and installed at Cheviré site, located in the port of Nantes. The facility will be operated by Autobidder and will be the France’s first large-scale 2-hour battery system
📷
btc
( twitter.com)

11个月前 • Tesla Megapack • 下载视频 0 评论

00:01:25

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GENOCIDE: The drive-by media consistently ignores the ongoing genocide of white people in South Africa, despite South African leaders openly endorsing the killing of white individuals while condemning the murder of black individuals. MP Julius Sello Malema has explicitly stated:
btc
( twitter.com)

10个月前 • @amuse • 下载视频 0 评论

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One of the most significant newsletters we've published: an intro to the great Chinese writer Yu Luoke, executed in Beijing's Workers Stadium at age 27. Best of all it's by someone who knew of Yu's works at the time, via
时政
( chinaunofficialarchives.substack.com)

7个月前 • Ian Johnson 0 评论

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Eighteen months after receiving Neuralink’s first-in-human brain-computer implant, Noland Arbaugh has turned a life once limited by paralysis into one filled with study, gaming, entrepreneurial plans, and near-daily public speaking.
The wireless chip’s 1,000-plus electrodes
btc
( twitter.com)

6个月前 • Wes Roth 0 评论

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xAI is building A Pure AI Software Company, Macrohard
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( twitter.com)

7个月前 • Tech Dev Notes 0 评论

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Can you explain to me why Bin Laden, who destroyed two buildings, was hunted by the CIA for years — but a war criminal who bombs cities in Europe every day is having a meeting with the President of the United States?
时政
( twitter.com)

7个月前 • Roman Sheremeta 🇺🇸🇺🇦 0 评论

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Has anyone offered a direct quote — in context — from Charlie Kirk that they considered racist or sexist or bigoted?
That dog is not barking.
By now, I should have seen plenty of examples. All I hear is generic insults and hate.
btc
( twitter.com)

6个月前 • Scott Adams 0 评论

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NORMAL: The Australian Federal Police confirmed on Thursday to the Australian Senate that they disrupted a plot by Chinese foreign intelligence in Australia to violently harm me and other Australian critics of the Chinese government like We were ''potential targets
时政
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1年前 • Drew Pavlou 🇦🇺🇺🇦🇹🇼 • 下载视频 0 评论

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The Chinese government is so far refusing to extradite a 33 year old Chinese national who deliberately threw boiling hot coffee over an infant child in Brisbane Australia last month. The child almost died of third degree burns.
Artwork by
时政
( twitter.com)

1年前 • Drew Pavlou 🇦🇺🇨🇾🇺🇸🇺🇦🇹🇼 0 评论

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I am delighted to welcome a Ukrainian delegation headed by the Deputy Minister of Finance Svitlana Vorobey in Melbourne today to officially commence negotiations of the tax treaty with the Treasury of Australia
Once negotiated, signed and ratified, the agreement
时政
( twitter.com)

1年前 • Vasyl Myroshnychenko 0 评论

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President Trump speaking to South Korea's parliament, June 8, 2017, about freedom, tyranny, peace through strength, friendship, faithful alliance, democracy's triumph in South Korea, and of course, the amazing Korean golfers. One of the greatest speeches by a U.S. president.
时政
( twitter.com)

1年前 • MilesYu 余茂春 0 评论

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GLOBAL OUTAGES
- Major banks, media and airlines affected by major IT outage
- Significant disruption to some Microsoft services
- 911 services disrupted in several US states
- Services at London Stock Exchange disrupted
- Sky News is off air
- Reports the issue relates to
时政
( twitter.com)

1年前 • The Spectator Index 0 评论

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In 2019, when the pro-democracy movement broke out, #HongKong journalist #GwynethHo live-streamed a brutal attack at the #YuenLong metro station.
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时政
( twitter.com)

1年前 • The Committee for Freedom in Hong Kong Foundation • 下载视频 0 评论

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BREAKING: 𝕏 debunked the mainstream media's false polls and claims that reported an even contest between Donald Trump and Kamala Harris.
Over a million people have already voted in Elon Musk's recent poll on 𝕏, with Donald Trump leading by 79%,
时政
( twitter.com)

1年前 • DogeDesigner • 下载视频 0 评论

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‼️ RSF is sounding the alarm as it’s now been 2 weeks since journalist #ZhangZhan was reportedly detained by police in Shanghai, still with no confirmation of her location or any charges. The Chinese authorities must #FreeZhangZhan without further delay!
时政
( rsf.org)

1年前 • RSF 0 评论

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Chinese Americans for Harris group canvassing in PA, led by CAFH Co Chair Paul Zhu, Vice Chair Lu Shi and NY Captain Lola Lam w/ team members worked tirelessly to encourage voter revision and early voting! Thank you. #Chineseamericansforharris #HarrisForPotus2024 #HarrisWalz2024
时政
( twitter.com)

1年前 • Chinese Americans for Harris • 下载视频 0 评论

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Exclusive: Ahoo Daryaei Revealed as the Woman Who Undressed in Protest Against Morality Police
Close associates of Ahoo Daryaei, a student who protested against morality police harassment at Tehran’s Science and Research University by removing her clothes, have shared photos and
时政
( twitter.com)

1年前 • Masih Alinejad 🏳️ 0 评论

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Harrison Okene spent 60 hours underwater in darkness after his boat capsized 20 miles off the coast of Nigeria and sank to the bottom of the ocean. He was discovered alive by divers who were sent to recover dead bodies
有趣
( twitter.com)

1年前 • non aesthetic things 0 评论

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Russian Lt. Gen. Igor Kirillov, head of the military’s nuclear, chemical and biological defense forces, was killed by a bomb placed on a scooter in Moscow on Tuesday. He's the most prominent military officer to be assassinated of the war. w/
时政
( www.ft.com)

1年前 • Christopher Miller 0 评论

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Ukraine and Poland understand what Washington doesn’t: Poland is next.
In 2013, Crimea’s annexation seemed unthinkable; by 2022, a full-scale invasion was a reality.
Zelenskyy: Ukraine's independence is a fundamental condition for the security of Poland and Europe
1/
时政
( twitter.com)

1年前 • Tymofiy Mylovanov • 下载视频 0 评论

00:00:29

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Dr. King once said, "Everybody can be great, because everybody can serve." True greatness lies in lifting others, making a difference, and serving with purpose. Let’s honor his legacy by finding ways to serve and create a better world together. #MLKDay
btc
( twitter.com)

1年前 • Tim Cook 0 评论

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BREAKING 🚨 Neuralink PRIME BCI helps Nick Wray mind-control his new assistive robotic arm
Grok by xAI is helping Neuralink in:
- thought to text generation
- faster communication using AI assistance
- synthesized voice cloning
- cognitive augmentation to connect at binary
btc
( twitter.com)

5个月前 • Prashant • 下载视频 0 评论

00:00:46

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A Chinese tourist poured concentrated bath gel into a Japanese onsen, turning it into a foamy disaster.
When confronted by staff, he replied — in English —
“I only speak Chinese,” then fled the scene.
Cultural exchange level: legendary.
#TGTM #BubbleDiplomacy #ChinaAbroad
时政
( twitter.com)

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

00:00:59

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Today marks 9 years/3287 days since my father’s unlawful arrest by the Chinese government. He was sentenced to 15 years in prison for compiling state-approved Uyghur textbooks. China release my father and all those innocent Uyghurs immediately!
#FreeUyghur #FreeYalqunRozi
时政
( twitter.com)

5个月前 • Tumaris Yalqun • 下载视频 0 评论

00:01:50