For Ber: 3 turn

What is 3 turn?
How to practice with 2 feet?
How to practice with 1 foot?

How the width of a horse's butt determined the Size of the Space Shuttle

by Rob Kall
===============
Here is an interesting story that ties together 2000 plus years of technology development.

The U.S. standard railroad gauge (distance between the rails) is 4 feet, 8.5 inches. That's an exceedingly odd number. Why was that gauge used? Because that is the way they built them in England, and the U.S. railroads were built by English expatriates. Why did the English people build them like that? Because the first rail lines were built by the same people who built the pre-railroad tramways, and that's the gauge they used. Why did they use that gauge then?

Because the people who built the tramways used the same jigs and tools that they used for building wagons, which used that wheel spacing. Okay! Why did the wagons use that odd wheel spacing? Well, if they tried to use any other spacing, the wagons would break on some of the old long-distance roads because that is the spacing of the old wheel ruts.

So, who built those old-rutted roads? The first long-distance roads in Europe were built by Imperial Rome for the benefit of their legions. The roads have been used ever since. And the ruts? The initial ruts, which everyone else had to match for fear of destroying their wagons, were first made by Roman war chariots. Since the chariots were made for or by Imperial Rome, they were all alike in the matter of wheel spacing. So, why did the Romans pick that spacing? Because the Imperial Roman chariots were made to be just wide enough to accommodate the backends of two horses.

What's this got o do with the Space Shuttle? The engineers who designed the solid rocket boosters, or SRBs, wanted to make them a bit fatter, but the SRBs had to be shipped by train from the factory to the launch site. The railroad line to the factory runs through a tunnel in the mountains. The SRBs had to fit through that tunnel. The tunnel is slightly wider than a railroad track, and the railroad track is about as wide as two horses' behinds. So,in summary, a major design feature of the world's most advanced transportation system was determined by the width of two horses' behinds!!

rob
PS I wrote this up (cleaning up an internet forward) about 12 years ago. It's still floating around on a number of websites.

Daddy: Rob wrote this in 1996.  My question is whether the facts are true?  It could be science fair project.

What should they be (2)?

Do not look like Star Wars guys? Who are they? Really.

Brian Kesinger and Bill Watterson

What should they be?

Who are these?  Does not look like star wars guys.

James Hance

Transatlantic (telegraph) Cable

https://en.wikipedia.org/wiki/Transatlantic_telegraph_cable


https://en.wikipedia.org/wiki/Cyrus_West_Field

Amazing! Amazing! Crazy!

snow removal

Since we have a big snow, it would be nice to see how people removing snow all around the world.  Could my kids help me dig on this?

Daddy's reading: Economy / Scrum / Business

Friedrich August von Hayek

The Pretence of Knowledge
http://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/1974/hayek-lecture.html


Scrum...

Ricardo Semler
http://www.strategy-business.com/article/05408?gko=3291c

School is closed!

Axi, our musician, could you get a parody for us?

How to draw people?

Brazilian artist Julio Cesar

代达罗斯

Daedalus

Please google this name and read the story.

Write your own story....

Online Materials

英文：
www.starfall.com       字母和Phonics
www.bookadventure.org  阅读理解
www.tumblebooks.com/   E-books (edited by Enjoymylife)
http://www.wordlywise3000.com/ （provided by REWY)
http://www.storylineonline.net/ (provided by iaya)

数学：
www.beestar.org    趣味数学题(free), GT MATH, English，science(收费）
http://it.pinellas.k12.fl.us/Teachers3/gurianb/sunshinemath.htm
http://www.mathsisfun.com/worksheets/kindergarten.php
SUNSHINE MATH
http://www.stmarknet.com/sunshine_math.htm
www.dreambox.com (provided by swinger)
www.ixl.com (provided by Swinger)

中文：
http://www.hwjyw.com/textbook.shtml 《中文》教材下载，多媒体教学
http://www.hanlexon.org/index.htm    写字
www.yes-chinese.com                  朗朗中文
http://ishare.iask.sina.com.cn/f/8003418.html?from=like  识字课本下载
http://www.nanhaibooks.com/chinese-language.html 网上购买中文教材

online free workbook sheet (edited by Enjoymylife)
www.edHelper.com
http://themathworksheetsite.com/
http://cybersleuth-kids.com//mathflash/mathflash.html

http://www.pipamag.org/ 小枇杷

发信人: StarVenus (参商*极品磨工~人不知而不愠), 信区: Parenting
标  题: Re: 有用网站合集
发信站: BBS 未名空间站 (Wed Oct 22 14:42:47 2014, 美东)

http://gongfubb.com/
http://code.org/
http://beijingmath.com/index.html
http://raz-kids.com/
http://readingeggs.com/

Beestar 免费数学应用题，每周练 1-8年级
http://www.beestar.org/exam?cmd=sample


Beestar 免费打印基本数学训练 1-8年级
http://www.beestar.org/worksheets/index.jsp


新加坡数学免费测试：1-4 年级
http://www.singaporemath.com/v/vspfiles/assets/images/pl_pm4ate
http://www.singaporemath.com/v/vspfiles/assets/images/pl_pm4bte

Long Ago and Today

Need a story.  Ber, you owe me one.

Food, Home, Road, Game, and Transportation

100 drones

Detail in here.
http://iq.intel.com/100-dancing-drones-set-world-record/

Levitron

Question:
Is this magic or science?
Why?

For Axi: The 100 Best Novels Written in English

http://www.theguardian.com/books/2015/aug/17/the-100-best-novels-written-in-english-the-full-list

2. Robinson Crusoe
https://www.gutenberg.org/files/521/521-h/521-h.htm

3. Gulliver’s Travels
http://www.gutenberg.org/files/829/829-h/829-h.htm

18. Alice's Adventures in Wonderland
http://www.gutenberg.org/files/11/11.txt

On 12 January 1628, a great writer was born

Who is he?
Where was he born?
What did he write?

Please research...

Waltz

Please list out the name and the composer in this clip.

看看她的手指

https://m.youtube.com/watch?feature=youtu.be&v=FVUxsIARciE

Adorable Rice Balls

Question:
1. How to make a rice ball?
2. How to make these rice balls? Any idea?

Fairytale-Like Illustrations by Swedish Artist Alexander Jansson