Quantum Leaps, Long Assumed to Be Instantaneous, Take Time

 

 

 

 

 

When quantum mechanics was first developed a century ago as a theory for understanding the atomic-scale world, one of its key concepts was so radical, bold and counter-intuitive that it passed into popular language: the “quantum leap.” Purists might object that the common habit of applying this term to a big change misses the point that jumps between two quantum states are typically tiny, which is precisely why they weren’t noticed sooner. But the real point is that they’re sudden. So sudden, in fact, that many of the pioneers of quantum mechanics assumed they were instantaneous.

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Físicos dizem ter evidências da ‘quinta força elemental’ da natureza

Pesquisadores na Hungria encontraram evidências da existência de uma quinta partícula fundamental, um bóson, que pode nos ajudar a explicar mistérios do universo como a matéria escura

 

Nosso universo é regido por quatro forças elementais: eletromagnetismo, gravidade e as forças nucleares forte e fraca. Elas são associadas a partículas fundamentais, os bósons: fótons para o eletromagnetismo, gravitons (ainda não detectados) para a gravidade, gluons para a força nuclear forte e W e Z para a força nuclear fraca.

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Teoría de la evolución de Darwin: por qué es incorrecto decir que “descendemos de los monos” y otras 4 cosas más

 

 

Este 24 de noviembre se cumplen 160 años desde la publicación de “El origen de las especies”, el libro en el que Charles Darwin estableció las bases de la teoría de la evolución por selección natural.

¿Pero cuánto sabemos sobre la historia de nuestra especie?

¿Y por qué es un error decir que “descendemos de los monos”?

En BBC Mundo recordamos cinco datos que tal vez puedan resultarte sorprendentes sobre la evolución humana.

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Quantum physics: Our study suggests objective reality doesn’t exist

 

 

 

 

 

 

Alternative facts are spreading like a virus across society. Now it seems they have even infected science—at least the quantum realm. This may seem counter intuitive. The scientific method is after all founded on the reliable notions of observation, measurement and repeatability. A fact, as established by a measurement, should be objective, such that all observers can agree with it.

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20 Minute Contact with Nature Reduces Stress Hormone Cortisol

 

 

 

 

 

The data revealed that just a twenty-minute nature experience was enough to significantly reduce cortisol levels. But if you spent a little more time immersed in a nature experience, 20 to 30 minutes sitting or walking, cortisol levels dropped at their greatest rate. After that, additional de-stressing benefits continue to add up but at a slower rate. The image is in the public domain.

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