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yang140on Show HN: How to mentally calculate the day of the week for any date

Author here, good call! I credit Conway in the center of the article, the content for "more on him at the end" was hidden after reader finish the challenge in part 6. I guess it worth to show it by default, updated already.

I'd also need to thanks for Dr. Arthur Benjamin. I saw his "That math show" with my 9 years old where he introduced this Doomsday rule, I thought it was really cool and try to create some interactive tutorial for it. Would love to see if this can help other kids or adults https://www.thatmathshow.com/

yang140on IA or AI?

John Markoff's new book "Machines of Loving Grace" is a great one about this AI vs IA topic. http://www.amazon.com/Machines-Loving-Grace-Common-Between/d...

yang140on A better user interface for math (2011)

Thanks for sharing this post. Bret mentioned this in his "Media for thinking unthinkable" talk that Mathematical notation itself is a great tool for making mathematical structure visible. They are like user interface, it tell things that language can't express. The birth of mathematical notation is considered to be birth of modern mathematics. With dynamic media provided by computer, there should be a better way to dynamically represent mathematical structure. With that in mind, I would also recommend Evan Miller's comment's on Bret Victor's "Kill Math" article called "Don't Kill Math". Evan empathize that besides dynamic simulation, we should also embrace "theory and calculation" to see the underlying structure.

http://worrydream.com/MediaForThinkingTheUnthinkable/ http://www.evanmiller.org/dont-kill-math.html

yang140on Silicon Valley History

I really like The Innovators by Walter Isaacson, it is a great book about the whole computer history and many ideas that made it possible.

yang140on Show HN: A real-time Bitcoin transaction map

That's also the question I have when working on it. The data is actually from blockchain.info's WebSockets. Maybe their transactions are mainly from US and Northern Europe, I was expecting to see more from Asia.

yang140on Show HN: A real-time Bitcoin transaction map

Thanks, It is just for fun. the address is based on the relay ip address. So it is not necessarily the real transaction address. I am making this as an example of learning d3.js. It is very interesting.