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 23

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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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Why is this video 4 hours long?
有趣
( twitter.com)

5天前 • NO CONTEXT HUMANS • 下载视频 0 评论

00:00:09

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Why is this video 4 hours long?
有趣
( twitter.com)

7天前 • NO CONTEXT HUMANS • 下载视频 0 评论

00:01:17

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I am as disgusted with this video as I am with the video from Manchester Airport. But why did this not get the same media attention. Makes you wonder
时政
( twitter.com)

1年前 • Brian pearson • 下载视频 0 评论

00:00:23

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🌎 This map of the bottom of the Atlantic Ocean was published in 1968 and is based on ocean depth surveys compiled by Bruce Heezen and Marie Tharp.. 😲 👉 The map was painted by Heinrich Berann for the magazine National Geographic
有趣
( twitter.com)

2年前 • Curiosity 0 评论

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Alligators move on land by 2 forms of locomotion called

- "sprawl" (with the belly making contact with the ground) and
- "high walk" (up-on-four-limbs).

This is a high walk used by a big one spotted in Central Florida

[📹 Kim Joiner]

有趣
( twitter.com)

2年前 • Massimo • 下载视频 0 评论

00:00:34

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The court ruling against TikTok finally destroys the maddening false pretence that a company controlled by a FOREIGN ADVERSARY, allowing access to its corporate and customer data, should enjoy full free speech protection in this country.
By U.S. Code of Federal Regulations (15
时政
( twitter.com)

1年前 • MilesYu 余茂春 0 评论

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Look at these statistics on national injunctions imposed by District Court judges from a recent Harvard Law Review article. 67% of all injunctions this century came against President Trump in his first term and 92% were imposed by Democrat-appointed judges. HT
btc
( twitter.com)

1年前 • Eric Teetsel 0 评论

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Yep, mark it down: by 2030 trans identification in kids and teens will be back well under 1 percent.
This was a cultural bubble aided by the massive profits available to surgeons and hospitals that pushed these mutilations, and it has decisively popped.
btc
( twitter.com)

5个月前 • Alex Berenson 0 评论

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🧵A privilege to speak at an event in Parliament this morning, alongside Ma Jian and a courageous young Chinese activist Apple Peiqing Ni, hosted by to commemorate #TiananmenSquareMassacre /
时政
( twitter.com)

1年前 • Benedict Rogers 羅傑斯 0 评论

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🧵A privilege to speak at an event in Parliament this morning, alongside Ma Jian and a courageous young Chinese activist Apple Peiqing Ni, hosted by to commemorate #TiananmenSquareMassacre /
时政
( twitter.com)

1年前 • Benedict Rogers 羅傑斯 0 评论

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BREAKING
India has launched at least three strikes against targets in Pakistani territory.
This has been confirmed by both governments.
A reminder: both India and Pakistan are nuclear powers.
时政
( twitter.com)

10个月前 • Yashar Ali 🐘 0 评论

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This terrible damage to the street art is done by a group of Chinese nationalist students who study in Royal college of Art

here is their group photo 🇨🇳
时政
( twitter.com)

2年前 • 巴丢草 Bad ї ucao 0 评论

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Sometimes securing the geology of a slope may go slightly wrong.

Watch the kinetic energy acquired by this rock and how it literally breaks a tree in two parts

有趣
( twitter.com)

2年前 • Massimo • 下载视频 0 评论

00:00:16

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Grok’s Conclusion:
“This document is almost certainly translated from Russian into English by a native Russian speaker or a non-professional translator. It is not originally written in English.
时政
( twitter.com)

3个月前 • Meaghan Mobbs 0 评论

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Christians are the most persecuted group in the world. Their plight is almost entirely ignored by corporate media. The horrible atrocities in Syria are part of this longstanding pattern. Pray for our persecuted brothers and sisters across the globe.
btc
( twitter.com)

1年前 • Matt Walsh 0 评论

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SKY NEWS HELPS US CATCH A CONVICTED ISLAMIST: This is Shehraz Sarwar from Birmingham, he was convicted and JAILED for shouting ‘Allahu Akbar’ and ‘boom’ on his journey home from Dubai to Birmingham.
In the video attached is Sarwar brandishing a "sword" like weapon in the middle
时政
( twitter.com)

1年前 • Antifa Public Watch official • 下载视频 0 评论

00:00:11

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Sketch from eyewitness video from #Gaza
16 days ago you were buried #MazenAlHamada , yet your courage, testimony, and image blazes across the world. This boy on a scooter, trying to survive a #genocide in #Gaza, carries your photo.
You are an inspiration, a light in the dark.
时政
( twitter.com)

1年前 • Marc Nelson 🌊 🇺🇦 🇵🇸 0 评论

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China’s High-Speed Rail Disaster— From Glory to Ghost Towns.
behind the CCP propaganda about high speed rail lies a darker story: empty platforms, ghost towns, and cities drowning in debt. In this video, I reveal the harsh truth about how political vanity projects left ordinary
时政
( twitter.com)

2个月前 • Ken Cao-The China Crash Chronicle • 下载视频 0 评论

00:13:30

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Premier Wen Predicted China's Collapse. Xi Proved Him Right.
Wen Jiabao Was Right. China’s Collapse Started in 2012. The Speech That Could Have Saved China – But Xi Ignored It. In this video, I break down former Chinese Premier Wen Jiabao’s historic warning from 2012 — a speech
时政
( twitter.com)

2个月前 • Ken Cao-The China Crash Chronicle • 下载视频 0 评论

00:08:33

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I just read a short story in The New Yorker by a Pulitzer Prize finalist. It included this sentence, similar to many others in the story.
"The wish to be context-free often came in the wake of an unresolvable pretext, which was where real life was."
Literature is in big
时政
( twitter.com)

8个月前 • Walter Kirn 0 评论

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And it only gets better from here.
Tesla is still on track to launch autonomous ride hailing in Austin in June and roll out to many cities in America by the end of this year.
The threshold is achieving safety far in excess of the average human driver.
Ultimately, autonomous
btc
( twitter.com)

1年前 • Elon Musk • 下载视频 0 评论

00:10:00

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😱😱 this is the MAGA cult and legacy of toxic Shot dead by her own father who walked free.
‘Lucy Harrison, from Warrington in Cheshire, was shot in the chest on 10 January 2025 in Prosper, near Dallas.
Police in the town investigated the 23-year-old's death as
时政
( twitter.com)

1个月前 • Xena 0 评论

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For the first time in this race, a new poll has us leading Ted Cruz by 1 point. I don't know about y'all but I'm fired up and ready to WIN!
We've got 47 days, let's do this Texas ➡
时政
( allred4tx.us)

1年前 • Colin Allred 0 评论

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This is the death of a single cell. This ciliate is in the genus Blepharisma, a microbial eukaryote. As the cell membrane lysis, the contents spills out. Magnified 400x and sped 6x real time

[source by Dr. Hunter N. Hines: ]

有趣
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2年前 • Massimo • 下载视频 0 评论

00:00:17

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my entire life in a video
有趣
( twitter.com)

1年前 • NO CONTEXT HUMANS • 下载视频 0 评论

00:01:00