El patrón secreto de los números que nunca te habían contado

Todos los días usamos números, pero no siempre nos fijamos en los patrones que esconden. Algunos se pueden utilizar para hacer cálculo mental. Otros, para deleite de la vista y los sentidos. Lo que es seguro es que los números cíclicos y el teorema de Midy merecen una vitrina propia en el museo de la teoría de números.


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Ya que has continuado la lectura hasta aquí, te cuento un poco más. Los números que al multiplicarlos por n mueven una cifra de un extremo a otro se denominan números n-parásitos. El 142857 es un número 5-parásito, porque al multiplicarlo por 5 mueve el siete de un extremo al otro: 714285. No siempre coinciden con los números cíclicos: el 128205 es un número 4-parásito, pues al multiplicarlo por 4 mueve una cifra de un extremo a otro, 512820, pero no es cíclico.

The 1995 Hubble photo that changed astronomy

If you hold a pin at arm’s length up in the air, the head of the pin covers approximately the amount of sky that appears in the Hubble Deep Field. The iconic 1995 image is crowded, not because it’s a broad swath of sky but because it’s a broad swath of time. The Hubble Deep Field is more than 12 billion light-years deep.

Robert Williams was the director of the Hubble’s science institute back in 1995, and it was his decision to attempt a deep field observation with the telescope. Previous calculations had indicated that Hubble would not be able to detect very distant galaxies, but Williams figured they’d never know unless they tried.

His team chose a completely dark part of the sky, in order to see beyond the stars of the Milky Way, and programmed Hubble to stare at that spot for 10 days. It was unusual to use precious observing time to point the telescope at nothing in particular, but that’s what they did.

“We didn’t know what was there, and that was the whole purpose of the observation, basically — to get a core sample of the universe,” Williams said, borrowing the concept of the “core sample” from the earth sciences.

“You do the same thing if you’re trying to understand the geology of the Earth: Pick some typical spot to drill down to try to understand exactly what the various layers of the Earth are and what they mean in terms of its geologic history.”

What makes the Hubble Deep Field an atypical core sample is that rather than observing the material as it is now, the telescope collected images of galaxies as they appeared millions and billions of years ago. Since light can only travel so fast, the telescope is a peephole into the history of the universe.

Full Interview: Edward Snowden On Trump, Privacy, And Threats To Democracy | The 11th Hour | MSNBC

On the eve of his memoir ‘Permanent Record’ being published, NSA whistleblower Edward Snowden talked at length from Moscow with MSNBC’s Brian Williams in an exclusive interview. This is their discussion in its entirety, edited down slightly for clarity.

The real reason Boeing’s new plane crashed twice

Two Boeing airplanes have fallen out of the air and crashed in the past six months. On the surface, this is a technical failure. But the real story is about a company’s desire to beat their rival.

Cómo se fija el precio del petróleo y cómo esto afecta a tu bolsillo

Cuando el precio del petróleo se dispara, esto puede terminar en un aumento del precio de la gasolina. ¿Cómo puede esto afectar a tu bolsillo? ¿Y cómo se fija el precio del petróleo? ¿Quiénes lo determinan? Estas preguntas te las contestamos en este video.

How Hormones Influence You and Your Mind

Hormones have an influence on how your brain works, can increase or decrease your energy level, control your emotions and mood, and even fat storage. Let’s see how they work!