Recreational mathematicians

Nob Yoshigahara

Nobuyuki Yoshigahara (芦ヶ原 伸之 Yoshigahara Nobuyuki, commonly known as "Nob"; May 27, 1936 – June 19, 2004) was perhaps Japan's most celebrated inventor, collector, solver, and communicator of puzzles. Nob graduated from the Tokyo Institute of Technology in applied chemistry. After becoming disenchanted with his career in high-polymer engineering, Nob turned to high school teaching as an educator of chemistry and mathematics. As a puzzle columnist, Nob was an active contributor to many journals and had monthly columns in various popular magazines including Quark. He penned over 80 books on puzzles. Perhaps best known as a puzzle inventor, he commercially licensed his designs, such as the Rush Hour puzzle game, to companies including Binary Arts (now known as ThinkFun), Ishi Press, and Hanayama. He was also an avid computer programmer who used computers to help solve mathematical puzzles. Nob was an active participant in the International Puzzle Party, traveling the world to attend the annual event. In 2005, the puzzle design competition of the International Puzzle Parties was renamed the Nob Yoshigahara Puzzle Design Competition. In 2003, the Association of Game & Puzzle Collectors awarded Nob with the Sam Loyd Award, given to individuals who have made a significant contribution to the world of mechanical puzzles. (Wikipedia).

Nob Yoshigahara
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Warring States Japan: Sengoku Jidai - The Death of Oda Nobunaga - Extra History - #4

Want Extra History weekly? Support us on Patreon! http://bit.ly/EHPatreon Oda Nobunaga's control of Japan grows shakier by the day as more rivals emerge to challenge his hold on Kyoto. Egged on by the puppet shogun, Ashikaga Yoshiaki, the powerful daimyo Takeda Shingen brings his army dow

From playlist Extra History: Japan - Sengoku Jidai

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Shwetaambara - Yodhakaa

Session 04 - Yodhakaa Song: Shwetaambara Written by Adi Shankaracharyar www.yodhakaa.com Darbuka Siva -- Percussion Pradeep Vijay -- Vocals & Slide Guitar Kalyani Nair -- Vocals Akshay Chakrapani -- Bass Guitar Sean Roldan -- Guitar

From playlist Indian Music

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Warring States Japan: Sengoku Jidai - How Toyotomi Unified Japan - Extra History - #5

Support Extra History on Patreon! http://bit.ly/EHPatreon With Oda Nobunaga dead, Japan hangs in the balance. His old retainer, Tokugawa Ieyasu, must flee for his life from the usurper Akechi Mitsuhide. He narrowly escapes with the help of his ninja ally Hattori Hanzo, but Oda's heir is n

From playlist Extra History: Japan - Sengoku Jidai

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Warring States Japan: Sengoku Jidai - The Siege of Inabayama Castle - Extra History - #2

Support Extra History on Patreon! http://bit.ly/EHPatreon With his western borders secure, Oda Nobunaga turns his attention east in the direction of the Shogun. When diplomacy fails to subdue the Saito clan that stands between him and Kyoto, Nobunaga enlists the aid of his brilliant diplo

From playlist Extra History: Japan - Sengoku Jidai

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A Simple Puzzle Stumps Many Adults. Can You Solve It?

"You have to solve this yourself, otherwise you won't see how beautiful it is," Lee Sallows. SoraNews24 https://soranews24.com/2017/06/17/sinisterly-simple-math-puzzle-for-elementary-school-kids-stumps-japanese-twitter-adults/ IT Media (Japanese) https://nlab.itmedia.co.jp/nl/articles/170

From playlist Math Puzzles, Riddles And Brain Teasers

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Double Circle Real 5x5x5 & WOW5 Puzzle Ring – Carl Hoff

I provide an update on my twisty puzzle design, the Double Circle Real 5×5×5, which was the topic of my presentation at G4G11. I also present my first puzzle ring design. The ring is named the Wrap O-round Weave Five, shorted to WOW5. Both puzzles have been featured in articles in Game & P

From playlist G4G12 Videos

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Mark Setteducati - Remembering Tom Rodgers and the birth of the Gathering for Gardner - CoM Apr 2022

In January 1993, a group of friends of Martin Gardner gathered at the Marriott hotel in downtown Atlanta for an exhibition of puzzles, present talks at local schools, and convene among themselves about magic, puzzles, math and all the topics Martin wrote about. The puzzle exhibition was he

From playlist Celebration of Mind

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Yoshimoto Cube (CG)

Naoki Yoshimoto invented in 1971.

From playlist CG animations

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Warring States Japan: Sengoku Jidai - Warrior Monks of Hongan-ji and Hiei - Extra History - #3

Support Extra History on Patreon! http://bit.ly/EHPatreon Now that he holds Kyoto, Oda Nobunaga finds himself the focus of enemies on all sides. Even the Shogun, who no longer needs his military assistance, turns against him. Oda marches north to quell the Asakura clan, only to be betraye

From playlist Extra History: Japan - Sengoku Jidai

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Driving Downtown - Hills Of San Francisco 4K - USA

Driving Downtown Neighborhoods - Nob Hill - San Francisco California USA - Episode 14. Starting Point: California Street - https://goo.gl/maps/s3MzN8uLjjk . Neighborhood: Nob Hill - https://goo.gl/maps/7yRKqi7LxwC2 . Nob Hill is a neighborhood in San Francisco, California. Nob Hill is a

From playlist Location by Country - United States of America - J Utah

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Collecting in Life and Death: The Curatorial Legacy of Leland Stanford Jr.

Leland Stanford Jr., only son of Governor and railroad tycoon Leland Stanford Sr. and heiress Jane Lathrop Stanford, died suddenly in 1884, just shy of his 16th birthday. It is no secret that the Leland Stanford Junior University and Museum were created in memoriam for Leland Jr., but much

From playlist Stanford Historical Society

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San Francisco and the Exploratorium - AGU 2015 (Part 1)

The American Geophysical Union (AGU) is the biggest Earth sciences meeting in the world, and I went to San Francisco to take part in it! In this video series I'll be taking you with me through the scientific conference and the sights of San Francisco, starting off with the incredible Expl

From playlist Studying my PhD at Exeter (EVERY VIDEO)

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Diagnosis of myocarditis and pericarditis (part 2) | NCLEX-RN | Khan Academy

Created by Raja Narayan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-cardiovascular-diseases/rn-myocarditis-and-pericarditis/v/treatment-of-myocarditis-and-pericarditis?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn Missed the previous lesson? https://ww

From playlist Circulatory system diseases | NCLEX-RN | Khan Academy

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Games: Biscuit Racing

Another game for you to try at home ;)

From playlist My Other Videos

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Tinkerer's Clock | Exploratorium | Throwback

Get caught up in the whimsy of the “Tinkerer's Clock”, built and installed for the Exploratorium’s new home at Pier 15 back in 2013, by British artist Tim Hunkin. Go behind the scenes to hear about Hunkin's vision for the clock and the clock's initial installation.

From playlist Exploratorium's 50th Anniversary : 1969-2019

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Riding the California St Cable Car - San Francisco Cable Car System - San Francisco California

"The San Francisco cable car system is the world's last manually operated cable car system. An icon of San Francisco, California, the cable car system forms part of the intermodal urban transport network operated by the San Francisco Municipal Railway. Of the twenty-three lines established

From playlist Trolleys Trams Subways Buses & Taxis

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Yoko Hiraoka, a Lecture/Recital of Japanese Biwa Music

February 20, 2008.  Yoko Hiraoka, a member of the Yamato Komyoji ryu, presents a lecture/recital of Japanese Biwa music. This 5-stringed lute with a powerful and raw timbre, has a history in Japan of at least 1300 years, and has been used both as a story-telling medium, and sometimes as an

From playlist MacMillan Center Archives

Related pages

Mathematical puzzle | Mechanical puzzle