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Xah Lee
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Xah Lee

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Difference Between Apple & PC keyboards http://xahlee.info/kbd/apple_pc_kb_diff.html
Ctrl, Alt/Option, Command, Windows keys. ⌘ Cmd and ❖ Win both send the same scancode. ⌥ Opt and Alt both send the same scancode. However, their behavior in Mac and Windows are different. scancode is a code the keyboard hardware sends. 〔Wikipedia Scancode〕 ...
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Xah Lee

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the Logitech M570 Trackball is surprisingly smooth. ball can spin for 1 sec. but the mouse wheel is like 1990s cheap mouse. http://xahlee.info/kbd/logitech_M570_trackball.html
The Logitech M570 Wireless Trackball came out in 2010-09 . Logitech Wireless Trackball M570 2-s “Logitech M570 Wireless Trackball” amazon. This is a improvement over Logitech's previous Logitech Trackman Wheel. A scroll wheel! Excellent. 2 extra programable buttons.
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understanding CSS3 Units http://xahlee.info/js/css_units.html
unit, meaning. em, Length equal to the current font size. (see detail below) (Note: it is NOT the width of “M”.) ex, A font's “x-height”, usually the height of the letter x. Typically about half of em. rem (CSS3), Length equal to the computed value of font-size on the root element.
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collection of Kinesis/ergodox Layouts.
after all experiments so far, am using d13, pretty much default.
http://xahlee.info/kbd/keyboard_Kinesis_thumb_keys_layout.html


I spend whole day today, thinking about optimal layout for the thumb keys on Kinesis. spend hours dithering, and no conclusion yet. I want to write out my thoughts now, maybe it'll clarify or as a record for future reference. the default layout is well designed, optimal for normal users who type ...
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Reading Notes on Basic Economics http://wordyenglish.com/misc/basic_economics.html

oh wow, Thomas Sowell is 86 now.

latest Thomas Sowell article. If you are professor, give As to all your black students. lol.

http://townhall.com/columnists/thomassowell/2016/09/27/favors-to-blacks-n2223691


Back in the 1960s, as large numbers of black students were entering a certain Ivy League university for the first time, someone asked a chemistry professor -- off the record -- what his response to them was. He said, "I give them all A's and B's. To hell with them."
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the Trackman Marble (left) ball is nice, but buttons stiff, and inward direction. worst is no mouse wheel. http://xahlee.info/kbd/trackball_Logitech_trackman_marble.html
The “Logitech Trackman Marble Mouse” is classic. It came out in 2004, and is still in production. People love it. Logitech Trackman Marble angle-view “Logitech Trackman Marble Mouse” 1500×1500 amazon. The ball is not the largest, but largish, and can spin for 1.5 second.
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#JavaScript Operators. assignment operator returns a value. var z = 5; returns 5 http://xahlee.info/js/javascript_operators.html
Arithmetic Operators. Basic arithmetic. // basic arithmetic 3 + 4; // 7 3 - 4; // -1 3 * 4; // 12 3 / 4; // 0.75 // negation -(3+4); // -7. Integer Quotient & Remainder. // get integer quotient Math.floor(7/2); // 3 // modular arithmetic; mod; get remainder 7 % 2; // 1. Power & Root.
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Kinesis Advantage vs Truly Ergonomic Keyboard
which is better?
http://xahlee.info/kbd/kinesis_vs_truly_ergo.html
It's hard to say. There are pros and cons. Kinesis 201133-s Truly Ergonomic Keyboard and Kinesis Advantage. pros for Kinesis: lots thumb keys. curved surface. This is more comfortable than flat surface. tented (the keys near center is higher than keys in sides. like a camping “tent”.).
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true and false are builtin boolean data types. 〔➤see JavaScript: Data Types〕. Zero, empty string, undefined , null , NaN , eval to false in a “if” statement. Everything else eval to true . // the following eval to false. Everything else is true. console.log( Boolean(0) ); // false ...
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#python for beginner. how to use the command line help http://xahlee.info/perl-python/doc_lookup.html
This page shows you how to use the builtin help system to read python docs. pydoc Command. In terminal type pydoc to get started. It'll print a summary of how to use it. For python 3, use pydoc3 . pydoc3 ... Show text documentation on something. may be the name of a Python keyword, ...
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Reading Notes on 〈Intimate Behavior〉 http://xahlee.org/Periodic_dosage_dir/t2/intimate_behavior.html

p.19: Observations of deprived children and careful experiments with monkeys have shown conclusively that it is instead the tender intimacies with the soft body of the mother which are vital in producing the essential bond of attachment that will be so important for successful social behaviour ...
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author of JavaScript in Depth.
Introduction
Am a pro programer and amature mathematician. I write a lot. Am mostly known for my Emacs & Emacs Lisp tutorial and Visual Dictionary of Special Plane Curves. 

I'll be posting here few times a day. Most will be from my site, both new and selected old articles.