Rüdiger Nitsch 🐧

[Code Geek @codek_tv]

a² - b² = (a+b)(a-b)

[George Lawrence @Georgemummysboy]

😂🤣😂, 🐶

[AlmaLinux @AlmaLinux]

🚨 Local privilege escalation via Copy Fail? Not on our watch.

AlmaLinux 8, 9, and 10 patches are live, ahead of upstream.

Go update your systems! https://t.co/DN5GxavFT9

[How To AI @HowToAI_]

Researchers proved that every single elementary function, sin, exp, log, sqrt, comes from one single binary operator.

It is like finding the “God Particle" for calculus.

In computer science, every complex program breaks down to a single logical operator: the NAND gate. It is the fundamental building block of all digital reality.

But for continuous math, physics, engineering, machine learning, we thought we needed a massive toolbox.

Addition. Subtraction. Trigonometry. Logarithms.

Every scientific calculator and neural network has to juggle all of them.

Until today.

But this paper proved that every single mathematical function can be generated by a single, bizarre binary operator.

eml(x,y) = exp(x) - ln(y).

Combine that with the number 1, and you can build everything.

Pi. The square root. Sine and Cosine. Arithmetic.

It is all just the exact same operator, repeating over and over again in a binary tree.

Nobody anticipated this existed. It was found by systematic exhaustive search.

But the implications for AI are massive.

Instead of an AI struggling to combine different mathematical rules to discover a new scientific law, it can just use a single, uniform architecture.

One trainable circuit. One repeatable node.

We thought the language of the universe was complex.

It turns out, it's just one equation repeating in the dark.

[Dhanian 🗯️ @e_opore]

MEMORY MANAGEMENT IN LINUX

Memory Management is a core responsibility of the Linux kernel
→ controls how memory is allocated and used
→ ensures efficient multitasking
→ isolates processes for security and stability

The Linux kernel manages both
→ Physical Memory (RAM)
→ Virtual Memory

WHAT IS MEMORY MANAGEMENT?

Application Starts
→ requests memory from kernel
→ kernel allocates required memory space

Kernel Responsibilities
→ allocate memory
→ free unused memory
→ manage virtual memory
→ protect process memory spaces

Goal
→ maximize performance and efficiency

PHYSICAL MEMORY (RAM)

RAM
→ stores actively running programs and data

Linux divides RAM into
→ Kernel Space
→ User Space

Kernel Space
→ reserved for kernel operations

User Space
→ used by applications and processes

VIRTUAL MEMORY

Linux uses Virtual Memory
→ each process gets its own virtual address space

Advantages
→ process isolation
→ larger usable memory space
→ improved security

Flow

Application
→ Virtual Address
→ MMU (Memory Management Unit)
→ Physical Address in RAM

MEMORY PAGING

Linux divides memory into fixed-size pages

Page
→ small block of memory (commonly 4 KB)

Paging Process

Virtual Memory
→ divided into pages

Kernel
→ maps pages to physical memory

Benefits
→ efficient memory allocation
→ easier swapping
→ reduced fragmentation

SWAPPING

When RAM becomes full
→ inactive pages moved to swap space on disk

Flow

RAM Full
→ Kernel selects inactive pages
→ moves them to Swap Partition/File
→ frees RAM for active processes

Purpose
→ prevent system crashes
→ support more processes than physical RAM alone

PAGE CACHE

Linux uses free RAM as cache

Disk Data
→ stored temporarily in RAM

Benefits
→ faster file access
→ reduced disk I/O

Flow

Application Requests File
→ kernel checks page cache
→ if found → return immediately
→ otherwise read from disk

SLAB ALLOCATOR

Kernel frequently allocates small objects

Slab Allocator
→ pre-allocates memory caches
→ improves allocation speed

Examples
→ process descriptors
→ file objects
→ network buffers

Benefits
→ reduced fragmentation
→ faster kernel performance

MEMORY STATES

Free Memory
→ available for allocation

Used Memory
→ currently allocated

Cached Memory
→ temporary storage for faster access

Buffered Memory
→ used for I/O buffering

Swap Memory
→ disk-based extension of RAM

OUT OF MEMORY (OOM) HANDLER

When system runs out of memory
→ Linux activates OOM Killer

OOM Killer
→ selects high-memory-consuming processes
→ terminates them to recover memory

Purpose
→ keep system operational

MEMORY PROTECTION

Each process has isolated memory space

Process A
→ cannot directly access Process B memory

Kernel
→ enforces permissions and isolation

Benefits
→ security
→ stability
→ crash prevention

MEMORY MANAGEMENT FLOW

Application
→ requests memory

Kernel
→ allocates virtual memory

MMU
→ translates addresses

RAM
→ stores active pages

Inactive Pages
→ moved to swap if needed

Kernel
→ reclaims memory when process exits

IMPORTANT LINUX MEMORY COMMANDS

free
→ displays memory usage

top / htop
→ monitor RAM consumption

vmstat
→ virtual memory statistics

swapon
→ manage swap space

cat /proc/meminfo
→ detailed memory information

KEY BENEFITS

Efficient Resource Usage
→ optimized RAM utilization

Process Isolation
→ secure multitasking

Performance Optimization
→ caching and paging improve speed

Scalability
→ supports systems from embedded devices to servers

SUMMARY

Linux Memory Management
→ allocates
→ tracks
→ protects
→ optimizes system memory

Core Components
→ virtual memory
→ paging
→ swap
→ page cache
→ slab allocator

Together
→ provide fast, stable, and scalable system performance

→ Get the Linux Mastery Ebook:
https://t.co/mCaIRlvD0A

[AstroBin.com @AstroBin_com]

AstroBin's Image of the Day: "Orion – C/2025 R3 (Pan-STARRS) Conjunction (2-panel mosaic)" by Julien De Winter and Sascha Ebeler - https://t.co/yB3fAcTJYr

#astrophotography

[ScieVision @scievision369]

Rindler Horizon ✍️

It is a concept in relativity theory that is quite straightforward but also quite bizarre. When one is traveling in a spaceship constantly accelerating, there comes a point where any light or signal emitted from outside the boundary cannot reach him. This imaginary line is known as the Rindler Horizon. Any object emitting light towards you from within this imaginary boundary will be able to get their light to you somehow but not those beyond it. With greater acceleration, the Rindler Horizon comes nearer to you. It should be pointed out that this horizon is neither an actual barrier nor a black hole; it occurs just due to the continuous acceleration of the observer in an empty, flat space.

[Faktillon 📯 @Faktillon]

Die besten Fakten als Buch 👉 https://t.co/kfNylU5yPy
Ehrliche Nachrichten auf 👉 https://t.co/uR45PLb1rR

[Cosmos Archive @cosmosarcive]

Can a black hole’s spin control the temperature of its cosmic inferno?

Behold three distinct realities in one image: a black hole spinning against its disk of superheated gas, one with zero spin, and one spinning in harmony with the disk. Each case pushes or pulls the disk’s inner edge, transforming how matter spirals inward and the X-rays we detect from Earth.

Prograde spin lets the disk plunge dangerously close, forging extreme heat and intense high-energy emission with a dramatically broadened iron line. Retrograde spin holds the disk farther out, cooling the frenzy.

[Math Hub @mathhub_vn]

Calc III: Where calculus meets geometry and physics.

[AstroBin.com @AstroBin_com]

AstroBin's Image of the Day: "Alone in the desert of Namibia" by Jakob Sahner - https://t.co/3BBfKPOZ2q

#astrophotography

[Ralph Ruthe @ralphruthe]

🔥

!B

[Matze G. FILIUS 🇹🇭 🇩🇪 🥝 @Invermectin1]

😂😂😂😂😂

AAALTER , böses Ding...

[Code Geek @codek_tv]

Vectors

[Elorm Daniel @elormkdaniel]

Understanding Ethernet Cable Categories Made Simple.

Choosing the right Ethernet cable is important for building a fast, stable, and future-ready network. From Cat5 to Cat8, each cable category is designed for different speeds, frequencies, and networking environments.

📘 In this infographic, you’ll learn:
✅ Speed capabilities of each cable type
✅ Frequency and distance support
✅ Best use cases for home, office, and data center networks
✅ Differences between Cat5, Cat5e, Cat6a, Cat7, Cat7a, and Cat8
✅ Which cable is best for switches, servers, Wi-Fi, CCTV, and high-speed networking

💡 Quick Highlights:
🔹 Cat5 – Basic networking
🔹 Cat5e – Home & small office networks
🔹 Cat6a – Enterprise and office deployments
🔹 Cat7/Cat7a – Shielded high-performance networking
🔹 Cat8 – Ultra-fast data center connectivity

📈 Whether you’re preparing for CCNA, working in networking, or designing enterprise infrastructure, understanding cable categories is essential.

[MathsWith Sam @Sam_Axiom]

Starting with one of the most fundamental laws of electricity -

Ohm’s Law ⚡

It explains how voltage, current, and resistance are connected inside an electric circuit.
In simple words, the current flowing through a conductor depends directly on the voltage applied across it and inversely on its resistance.

This law forms the basic foundation of circuit analysis, electronics, electrical engineering, and modern technology. From household appliances to advanced electronic devices, Ohm’s Law plays an important role everywhere.

[David Gilmour @davidgilmour]

My dear friend Dick Parry died this morning.

Since I was seventeen, I have played in bands with Dick on saxophone, including Pink Floyd.

His feel and tone make his saxophone playing unmistakable, a signature of enormous beauty that is known to millions and is such a big part of songs such as Shine On You Crazy Diamond, Wish You Were Here, Us and Them and Money.

He played in the last band I had that included Rick Wright for the On An Island Tour and at Live 8 with Pink Floyd.

Here are some pictures of him, including one of him and me playing for the ABC Minors at the Victoria Cinema in Cambridge in 1963.

[SudoX7 @sudox7]

every for loop in C is syntactic sugar. the compiler sees a while loop. they produce identical machine code

C has three loop constructs: for, while, do-while. at the assembly level there is one: a conditional jump

the compiler doesn't care which one you wrote. it cares what the condition is and where to jump. every loop you've ever written becomes CMP, JNE, and a label

[George Lawrence @Georgemummysboy]

😂🤣😂, 🐷🐺

[Ralph Ruthe @ralphruthe]

Genial.

!B