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Can you guess which door the ball will hit in these machine puzzles?


I challenge you to these six machine puzzles. Guess which door the ball will go through by imagining how the machine will run. I bet no one can get all six correct!

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Filmed during Kilauea’s eruption in 2018...

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Narrated by Fred Mills. Additional footage and images courtesy of Shihan Shan, Google Earth, SkyscraperPage, Haroon Sadiq, Omeas Mumtaz Siddiqui, Ahsan Miana, Mott MacDonald, Le Grand Portage, Iran Water and Power Resources Development Co, State Power Dadu Hydropower Development Co and Li Donghui.

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What it’s like to board a U.S. Navy attack submarine in the Arctic


From Smarter Every Day...

16 random things that annoy everyone


From comedian Trey Kennedy...

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How does the size of the Moon compare with other moons in our solar system?


From the smallest to the largest, compared to New York City and Earth.

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Who would be King of America if George Washington had been made a monarch?


Drawn from The Washingtons: Seven Generations of the Presidential Branch.

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sky加速器打不开了-outline


This Apollo 16 Rover traverse to Station 4 was filmed in 16mm, color-corrected, and interpolated from 12 to 60 frames per second.

Why didn’t the Spanish colonies in America become a single country like the United States did?


The colonies of Spain spanned most of the Americas, yet for some reason they became a hodgepodge of independent countries, rather than a federal union like the United States. So, what prevented the emergence of a Spanish American Union?

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Mindjet MindManager 2021中文破解版下载 - 软件学堂:2021-12-18 · Mindjet MindManager 2021是一款专业的思维导图软件,是由美国的Mindjet公司强强发布的,MindManager系列软件在全球都是非常受用户欢迎的一款思维导图软件,特别是小编本次带来的这个版本,用户更是爱不释手,它众“界面可视化,有着直观 ...


The Sistine Chapel is one of the most iconic buildings on earth — but there’s a lot you probably don't know about it. In this tour-de-force talk, art historian Elizabeth Lev guides us across the famous building’s ceiling and Michelangelo’s vital depiction of traditional stories, showing how the painter reached beyond the religious iconography of the time to chart new artistic waters. Five hundred years after the artist painted it, says Lev, the Sistine Chapel forces us to look around as if it were a mirror and ask, “Who am I, and what role do I play in this great theater of life?”
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