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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Los abrazos activan la química cerebral del bienestar, la calma y la alegría, a corto y largo plazo

Los niños “tocan base” cuando están corriendo alegremente y, de repente, se sientan en el regazo de mamá o de papá, se apoyan en ellos o buscan algún tipo de contacto. Esta actitud puede durar segundos, o apenas unos minutos. Enseguida vuelven a sus juegos. Esto se llama “reabastecimiento emocional” y sirve para crear un precioso equilibrio químico en sus cerebros. Si tu hija o hijo se comporta así contigo, te hace un gran cumplido: te considera una fuente natural de opioides cerebrales.

Tanto nuestro cuerpo como nuestro cerebro secretan hormonas, poderosas sustancias químicas que nos pueden hacer sentir muy bien o muy mal. Normalmente, pensamos en las hormonas solo en relación con nuestra sexualidad, pero existen muchos tipos que nos afectan de muchas maneras en nuestros sentimientos, percepciones y comportamientos.
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The Fearful Mind

Fear is a hardwired response, but it doesn’t have to rule our emotions.

Nearly one fifth of the U.S. adult population suffers from an anxiety disorder, according to 2018 data. At their core, the worry and panic that make up general anxiety stem from an overactive fear response in the brain. And indeed, that primordial reaction is one of the most examined topics in neuroscience— investigated in rodents, humans, other apes and even invertebrates.

But how much do those automatic feelings relate to the emotions that humans associate with fear and, subsequently, their experience in the world? To sort out the issue, as six neuroscientists discuss in a fascinating Q&A in these pages, step one is for the field to come to agreement over an exact definition of fear and how best to study it (see “Embracing Our Fear”).

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Physicist suggests ‘quantum foam’ may explain away huge cosmic energy


Steven Carlip, a physicist at the University of California, has come up with a theory to explain why empty space seems to be filled with a huge amount of energy—it may be hidden by effects that are canceling it out at the Planck scale. He has published a paper describing his new theory in the journal Physical Review Letters.

Conventional theory suggests that should be filled with a huge amount of energy—perhaps as much as 10120 more than seemingly exists. Over the years, many theorists have suggested ideas on why this may be—most have tried the obvious approach, trying to figure out a way to make the energy go away. But none have been successful. In this new effort, Carlip suggests that maybe all that energy really is there, but it does not have any ties to the expansion of the universe because its effects are being canceled out by something at the Planck scale.

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Os suplementos de magnésio podem ser uma alternativa aos antidepressivos

Um recente ensaio clínico realizado nos Estados Unidos descobriu que os suplementos de magnésio são eficazes no tratamento da depressão leve ou moderada. Publicado no jornal PLoS One, os pesquisadores mostraram que

a suplementação diária com magnésio leva a uma diminuição significativa nos sintomas de depressão e ansiedade, independentemente da idade, do gênero, da gravidade da depressão ou do uso de drogas antidepressivas do paciente. Observando que o mineral funciona rapidamente e é bem tolerado, o estudo concluiu que pode ser uma alternativa segura à medicação farmacêutica.

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