The American astronauts calculated critical course-correction maneuvers on their HP-65 programmable hand-held during the rendezvous of the U.S. and Russian spacecraft.

In the 1920's, Jan Lukasiewicz developed a formal logic system which allowed mathematical expressions to be specified without parentheses by placing the operators before (prefix notation) or after (postfix notation) the operands. For example, the (infix notation) expression

(4 + 5) × 6
could be expressed in prefix notation as

× 6 + 4 5 or × + 4 5 6
and could be expressed in postfix notation as

4 5 + 6 × or 6 4 5 + ×
Prefix notation also came to be known as Polish Notation in honor of Lukasiewicz. HP adjusted the postfix notation for a calculator keyboard, added a stack to hold the operands and functions to reorder the stack. HP dubbed the result Reverse Polish Notation (RPN) also in honor of Lukasiewicz.

In the years that followed, computer scientists realized that RPN or postfix notation was very efficient for computer math. As a postfix expression is scanned from left to right, operands are simply placed into a last-in, first-out (LIFO) stack and operators may be immediately applied to the operands at the bottom of the stack.

Wolfram argued that, early on, the language saved its adopters from their darkest fear: “That they would always delegate the process of computation to somebody who would be down in the dungeon somewhere actually dealing with the computer.

“The big transformative thing that happened as a result of the release of Mathematica — and it happened rather quickly — was that people like theoretical physicists, mathematicians, things like this … Those kinds of people, were able to go from thinking of a computation to actually doing a computation directly, and were able to, therefore, get much further in lots and lots of different areas.

“And it’s been wonderful over the last third of a century to see all the inventions and discoveries that have been made using the technology that we built.”

Latest Downloads

• 32bit - rachel-pi_09_06_2021 20
• https://ftp.worldpossible.org/rachel-pi/beta/rachel-pi_09_06_2021.zip
• 32bit Raspberry Pi 3B+ image - rachel-pi_10_18_2021-3B.zip
• https://ftp.worldpossible.org/rachel-pi/beta/rachel-pi_10_18_2021-3B.zip

Please use the 3B+ image for 3B devices.

This image includes support for Kiwix 3.1.2 modules. These modules are named with “_2021”. Older Wikipedia modules are not compatible with this image. Please make sure to download and install the latest Kiwix modules that include “_2021” in their name.

en-moodle, en-file_share, en-kolibri-index, en-ka-lite, and older Kiwix modules ( Wikipedia ) are not supported with this image when downloaded. en-file_share and en-kolibri-index are included with the images.

You can expect to get roughly 8 users connected by default without a separate wifi router or USB wifi interface.

https://ftp.worldpossible.org/rachel-pi/tutorials/01_installing_rachel_pi.pdf

https://ftp.worldpossible.org/rachel-pi/tutorials/02_Installing_Modules.pdf

EduPak replaces rote teaching with the spark of modern technology.

We use a media storage device (Synology DS218+ w/ 2x 2TB HDD) and wireless technology to stream thousands of videos to any wifi enabled device. All tablets, cell phones, laptops and desktops that have wifi access can access our media storage device that delivers thousands of educational videos ///

[compare with RACHEL (worldpossible.org) ]

Intro to CS using MakeCode & Microbits Course Introduction This is an introduction to coding and computer science by way of making and design, using the revolutionary new micro:bit microcontroller board, and Microsoft’s easy and powerful MakeCode block-based coding environment. It is a project-based curriculum with a maker philosophy at its core; the idea is that by making physical objects, students create a context for learning the coding and computer science concepts.

A 14 week Introduction to Computer Science course.

This course is targeted to middle school grades 6-8 (ages 11-14 years). It is also written for teachers who may not have a Computer Science background, or who may be teaching an “Intro to Computer Science” course for the first time.

This course takes approximately 14 weeks to complete, spending about 1 week on each of the first 11 lessons, and 3 weeks for students to complete the final project at the end. Of course, teachers should feel free to customize the curriculum to meet individual school or district resources and timeframe.

A 14 week Introduction to Computer Science course.

This course is targeted to middle school grades 6-8 (ages 11-14 years). It is also written for teachers who may not have a Computer Science background, or who may be teaching an “Intro to Computer Science” course for the first time.

This course takes approximately 14 weeks to complete, spending about 1 week on each of the first 11 lessons, and 3 weeks for students to complete the final project at the end. Of course, teachers should feel free to customize the curriculum to meet individual school or district resources and timeframe.

A collection of the world's best Open Educational Resources.
Download ContentRACHEL is the easiest way to download and deploy free content repackaged for offline users. We specifically curate content to serve the needs of offline populations in developing countries.

RACHEL (Remote Area Community Hotspot for Education and Learning) is a portable, battery-powered, device that contains copies of educational websites in offline format. This means RACHEL can go anywhere in the world and wirelessly deliver free digital educational content to nearby tablets, laptops, or smartphones with no internet or data plans required. RACHEL has been taken to over 53 countries since its creation, serving students in rural villages, townships, and even prisons.

Computer generated faces --

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

Good artists copy. Great artists steal. Greatest artists copy, then paste.

Simplicity. Elegance. Form. Function.

Today marks a new beginning for programmers around the world. Stack Overflow is proud to unveil our first venture into hardware, The Key™.

They say good artists copy, but great artists steal. They were wrong. Great artists, developers, and engineers copy. Then they paste.

Every day, millions of innovators and creators across the globe move society and industry forward by copy-pasting code from Stack Overflow. But for too long, this process has been stuck in the past. //

Our keyboard is made of 100% machine milled plastic sourced from the rarest polyurethane plants.

The switches underneath each keycap have been rigorously tested to ensure the optimal finger feel and smooth action.

What happens when you press a keyboard? It clicks. Every day you’re working on a computer, you’re hearing thousands of clicks. Millions of clicks shape your experience each year.

Our click’s volume and tone were crafted by sampling the natural wonder of song bird chirps. We run that audio data through cutting edge deep learning systems to produce a sound that is optimized to improve productivity and mood.

Each key cap has been precisely etched using industrial grade lasers normally reserved for diamond cutting and quantum fusion drives.

The Key™ is compatible with virtually any computing device. From a Raspberry Pi to a high end gaming rig, cutting edge copy-paste is within your reach. //

UPDATE 2: The Key is actually, for real available for pre-order. Our original production line sold out in six hours, so please be patient.

How Bulgaria tried—and failed—to save communism by computerizing the 1980s generation. //

http://web.archive.org/web/20210929131440/https://logicmag.io/kids/socialist-cyborgs/

Supermicro SuperServer 5028D-TN4T Mini Tower

• Mini Tower NAS
• Integrated Intel® Xeon® D-1540 (8-core, 2GHz, 12MB Cache, 45W)
• 4 x DDR4 DIMM Sockets
• Up to 6 Hot-Swap SATA 3.5" Hard Drive Bays (2x 2.5" internal)
• 1 x PCI-E 3.0 x16 LP
• Dual-Port 1 Gigabit Ethernet (2 x RJ45)
• Dual-Port 10GBase-T Ethernet (2 x RJ45)
• FreeNAS and NAS4Free Supported
• 250W Bronze Power Supply

$1600

Space-efficient, compact design
• Network Security Appliance
• Cloud and Virtualization
• High Performance NAS Servers
• Business Critical Applications
• Small and Medium Business
• SR-IOV supported (for Xeon D-1541)

1. Intel® Xeon® processor D-1541,
   Single socket FCBGA 1667;
   8-Core, 45W
2. 4x 3.5" Hot-swap drive bays;
   2x 2.5" fixed drive bays
3. 1x PCI-E 3.0 x16 (LP), 1x M.2
   PCI-E 3.0 x4, M Key 2242/2280
4. Up to 128GB ECC RDIMM DDR4
   2400MHz or 64GB ECC/non-ECC
   UDIMM in 4 sockets
5. Dual 10GbE LAN and Intel® i350-AM2
   dual port GbE LAN
6. 250W Flex ATX Multi-output Bronze
   Power Supply

Noctua NF-A9 FLX, Premium Quiet Fan, 3-Pin (92mm, Brown)
Premium quiet fan, 92x92x25 mm, 12V, 3-pin Molex, 1600/1250/1050 RPM, max. 17.1 dB(A), >150,000 h MTTF
Award-winning 92x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance

$17

Computer power supply units (PSU) deliver the power to the PC hardware via a number of cables with connectors. Their generic specifications for various desktop systems are defined in Intel's design guides, which used to be periodically revised. Their latest standard is PSU Design Guide rev.2.0 released on June 2018. This document combines the requirements for ATX12V v2.52 and its five variations. Note that some brand name manufacturers did not follow Intel guidelines and used non-standard pinouts. Also see the information on new ATX12VO standard.

Standard ATX power supplies typically have the main power connector P1, additional 12V connectors, as well as peripheral, floppy drive, serial ATA, and PCI Express® receptacles, which we will describe below.

It's been 30 years since Finnish graduate student Linus Torvalds drafted a brief note saying he was starting a hobby operating system. The world would never be the same.

• Build your storage system by adding four 2.5in SAS or SATA drives into one 5.25in bay
• Supports a wide range of SSDs and HDDs from 5-15mm
• Easy, error free insertion of tray with vertically or horizontally mounted backplane

Simply put, a PCIe x4 card CAN fit in a PCIe x16 slot. The main reason this is possible lies within the fact that PCIe standard is cross-compatible as well as backward compatible.

Meaning, PCIe devices can work in different slots as long as they are provided the required PCIe lanes. They can also work across different generation provided that they get enough bandwidth.

So Can PCIe x4 Card Fit in x16 slot? Yes, it can. However, whether this is a good idea or not is something we explore further in this article.

The key point to note here is that the PCIe device and slot work at the speeds of the slowest component. So putting the x4 device in an x16 slot will not result in any performance boost.