Rafa

Programador, runner. Tecnología, ciencia, arte y animales. Ex-músico. Quiero vivir eternamente.

[Rafa @rafathan75]

Relato del 15K Nocturno Castellón del pasado Sábado.
Me ha costado un huevo escribirlo, espero que alguien lo lea 😆
https://t.co/eN9wzcBxXC

[Todd Spence @Todd_Spence]

Mel Brooks always said he and the cast of YOUNG FRANKENSTEIN had such a good time making the film, they could barely get through any of the takes 😂 I could watch this all day

[Rafa @rafathan75]

Si esta foto me duele, ¿por qué la conservo? 🤷

[Rafa @rafathan75]

Ay!! Mis tendones

[Volcaholic 🌋 @volcaholic1]

One of the best captures of a volcanic shockwave I’ve ever seen....💥

🔊 Sound up and wait for it....

📍 Tavurvur, Papua New Guinea in 2014

[Joan Anton Català Amigó @estelsiplanetes]

Sí!
A la foto que Wiseman va enviar ahir des de la nau Orion es veu perfectament Catalunya. Què més s'hi veu?

* 2 aurores: una boreal a dalt a la dreta i una austral a sota a l'esquerra
* llum zodiacal generada per l'atmosfera (a l'esquerra)
* el planeta Venus (el punt brillant)
* les llums de les ciutats

Aquest planeta és l'enveja de l'univers sencer.

[Joan Anton Català Amigó @estelsiplanetes]

Aquest és el camí que farà Artemis II.
Crèdit: NASA.

[Amazing Space @AmazingSpace2]

Artemis II animation - fuel use during launch

[Science girl @sciencegirl]

A knight’s tour is a path where a knight moves across all 64 squares of a chessboard exactly once.

[Math Files @Math_files]

This is the most dangerous problem in mathematics. Here’s how it works.

Pick a number — seven. (you can take any number).

Now apply two rules:

1. If the number is odd, multiply it by 3 and add 1.
 3 × 7 = 21, plus 1 = 22
2. If the number is even, divide it by 2.
 22 ÷ 2 = 11

Now we keep applying the rules:
11 is odd → 3 × 11 + 1 = 34
34 is even → 34 ÷ 2 = 17
17 is odd → 3 × 17 + 1 = 52
52 → 26 → 13
13 → 40
40 → 20 → 10 → 5
5 is odd → 3 × 5 + 1 = 16
16 → 8 → 4 → 2 → 1

Now 1 is odd → 3 × 1 + 1 = 4

But 4 → 2 → 1
So we are in a loop: 4 → 2 → 1

This is known as the Collatz conjecture and says that every positive integer, if you apply these rules, will eventually fall into the 4 → 2 → 1 loop.

[Science girl @sciencegirl]

Ulexite stone is a mineral, it is not transparent but yet it projects an image of what ever is behind it onto its surface

[Joan Anton Català Amigó @estelsiplanetes]

Magnífica seqüència enregistrada des de l'Estació Espacial Internacional per l'astronauta Don Pettit, que mostra una sortida de Sol i el cometa C/2023 A3.

[Physics In History @PhysInHistory]

The Feynman point is the name given to the position in the decimal expansion of π where a sequence of six consecutive nines first appears. It is named after the physicist Richard Feynman, who allegedly joked that he would like to memorize the digits of pi up to that point and then say “and so on” as if π. were rational. The Feynman point occurs at the 762nd digit after the decimal point, which is much earlier than expected by chance. ✍️

[Astronomy Vibes @AstronomyVibes]

Saturn’s moon Pan also known as flying saucer.

[SpaceEngine sim]

[Wonder of Science @wonderofscience]

A stunning timelapse of the Sun created using 40,000 photos captured over 3 hours with a solar telescope.

📽: Shannon Norton
https://t.co/rB7fwNrRXF

[William A. Wallace, Ph.D. @WilliamWallace]

💪 Muscle cells merging in real time

You’re watching one of [in my opinion] the coolest things your body does without you ever noticing
(muscle precursor cells literally fusing into one long, powerful fiber).

🔵 Alignment: individual myoblasts migrate and line up like they’re preparing for formation
🟢 Recognition: cells “sense” compatible neighbors through surface proteins
🟡 Contact: membranes begin to thin and synchronize their signaling
🟠 Fusion: boundaries dissolve and nuclei gather inside a shared cytoplasm
🔴 Strengthening: the new multinucleated fiber becomes the machinery that lets you lift, run, and repair

The glowing green nuclei are each a tiny command center contributed by a merging cell.
The red signal traces the membranes as they stretch, touch, and finally blend into a unified structure.

This is how muscles grow and regenerate - i.e. this is "strength" engineerednat the cellular level

Credit: Yue Lu, Elizabeth Chen Lab

[Interesting AF @interesting_aIl]

This man made every pianist question their abilities. Slim Gaillard playing with his hands upside down (1962)

[Science girl @sciencegirl]

The forbidden math spiral

📹fascinating.fractals

[Shining Science @ShiningScience]

In zero gravity, a candle flame forms a small blue sphere instead of the familiar teardrop shape.
Without gravity, hot air doesn’t rise, so the flame no longer stretches upward.
Instead, gases spread evenly in all directions, creating a smooth, round flame.
This environment allows the fuel to burn more completely, which is why the flame appears blue and produces no soot.
The result is a calm, gentle orb of fire that behaves very differently from a candle flame on Earth.

[Brian Greene @bgreene]

Strands of a spider web--amazing electron microscope image (by Dr Martín Ramírez). Hidden wonders.

[Joan Anton Català Amigó @estelsiplanetes]

Voleu escoltar descàrregues elèctriques a Mart?
Les tempestes i remolins de sorra les provoquen, per fricció entre els granets de pols. I el seu so ha estat enregistrat per un dels micròfons del robot Perseverance.
El que escoltareu és el so del vent que provoca un remolí i, de sobte, 3 tics que corresponen a les descàrregues.
Aquestes espurnes, però, no generen llum (no tenen suficient potència com per a ionitzar l'aire marcià)
https://t.co/f4lLwBHAh1