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TCP port knocking.

The brain truly is a system with terrible service availability. On average, after running for just 16 hours, it must be offlined for 8 hours to run maintenance tasks such as "scrub…

Is a binary search involved in this "gambling system"?

+1. Gorden Bell said a new computer category would enter the market every decade [1]. PDP-8 and later the PDP-11 were the quintessential minicomputer category makers. They were bas…

In 1987, doxxing yourself was the norm. ~80% of the Usenet messages from the 1980s (to early the 1990s) had names, institutions, office addresses, and phone numbers attached to the…

Sorry, it was a typo. I meant 2/3 (including common cables and fiber optics), not 1/3.

What an embarrassing typo! I was thinking of 0.66, and somehow I thought 0.66 = 1/3 (must've been distracted by the "2" in 1/2). I should've written 0.66 or 2/3.

1/2 c in circuit boards (FR-4), 1/3 c in cables, two useful numbers to remember.

I remember reading a great answer [1] from Stack Exchange, that claims: > the 1873 treatise used a pre-Heavisde form of vector calculus cannnibalized from Hamilton's quaternions ..…

> You read some Wikipedia pages and Feynman lectures of physics. I'm a physicist who has done well over a decade of research in magnetic materials. In the same way that a geodesist…

You said, > Ferromagnetism has nothing to do with currents This is why I said ferromagnetism is circulating current in the sense of "to a first approximation" and "heuristically". …

Knowing superconductivity makes magnets less mysterious. Once you accept that physics absolutely allows the creation of a static magnetic field from a circulating current that flow…

> I must confess, when I tried to answer the question I got it wrong...! (I feel silly). In programming there are two difficult problems - naming things, cache invalidation, and of…

> There’s also part of, good designs don’t depend on high precision components. I think TAoE emphasized that. If I call correctly, TAoE said engineering calculations should never k…

Also, in page 452 [5], Heaviside wrote: div B = 0 Finally in page 475 [6]: div D = ρ So yes, essentially all 4 Maxwell's equations were here. [5] https://archive.org/details/electr…

> Maxwell was also not really taking advantage of them much and always split them up into scalar and vector part. Did Maxwell actually use quaternions? If I recall correctly, at le…

I tried the quadratic equation, which is infamous for its loss of precision in numerical computations. The best output was merely a rewrite of the original equation using FMA (I'm …

> and the syntax isn't that great, nobody even knows they exist. Linux kernel maintainers certainly do - they even invented a non-standard extension of C99's VLA notation (their ow…