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  • Sobre la teoría de la relatividad especial y general - Albert Einstein May 24, 2017
    Entre el Electromagnetismo y la Mecánica newtoniana existe una fórmula de bisagra: la teoría de la relatividad especial y general. La importancia del nuevo marco planteado por Albert Einstein se entiende por lo siguiente: la percepción del tiempo y el espacio es relativa al observador. ¿Qué significa esto? Si usted viaja a una velocidad mayor que la de la lu […]
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  • La teoría del todo - Stephen W. Hawking May 24, 2017
    Una manera clara y amena de acercarse a los misterios del universo. En esta esclarecedora obra, el gran físico británico Stephen Hawking nos ofrece una historia del universo, del big bang a los agujeros negros. En siete pasos, Hawking logra explicar la historia del universo, desde las primeras teorías del mundo griego y de la época medieval hasta las más com […]
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  • Inteligencia emocional para niños. Guía práctica para padres y educadores - Mireia Golobardes Subirana & Sandra Celeiro González May 24, 2017
    ¿Cómo podemos enseñar a los más pequeños a gestionar sus emociones? ¿Cómo ayudar a nuestros hijos a mejorar en sus relaciones con los demás? ¿Cómo facilitar a nuestros alumnos su capacidad para identificar sus emociones y la de los demás y favorecer relaciones sanas y positivas, con empatía y respeto? ¿Cómo contribuir a que padres y profesores puedan también […]
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  • Tricks Any Dog Can Do! - Susan Day May 24, 2017
    This great book comes with advice and guidance as to the best way to teach these tricks. It offers more than one method which the reader can choose depending upon their own situation. There is also advice to using treats and shows you how to not end up with a treat junkie! This books is from the desk of Susan Day, a canine behaviourist. Susan teaches obedien […]
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  • La física del futuro - Michio Kaku May 24, 2017
    Un recorrido asombroso a través de los próximos cien años de revolución científica. El futuro ya se está inventando en los laboratorios de los científicos más punteros de todo el mundo. Con toda probabilidad, en 2100 controlaremos los ordenadores a través de diminutos sensores cerebrales y podremos mover objetos con el poder de nuestras mentes, la inteligenc […]
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  • Breve historia de mi vida - Stephen Hawking May 24, 2017
    La mente maravillosa de Stephen Hawking ha deslumbrado al mundo entero revelando los misterios del universo. Ahora, por primera vez, el cosmólogo más brillante de nuestra era explora, con una mirada reveladora, su propia vida y evolución intelectual. Breve historia de mi vida cuenta el sorprendente viaje de Stephen Hawking desde su niñez […]
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  • El gran diseño - Stephen Hawking & Leonard Mlodinow May 24, 2017
    Aun antes de aparecer, este libro ha venido precedido, en todos los medios de comunicación, de una extraordinaria polémica sobre  sus conclusiones: que tanto nuestro universo como los otros muchos universos posibles surgieron de la nada, porque su creación no requiere de la intervención de ningún Dios o ser sobrenatural, sino que todos los universos pro […]
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  • ¿Cómo pensar como Sherlock Holmes? - Maria Konnikova May 24, 2017
    Ningún personaje de ficción es más conocido por sus poderes de intuición y observación que Sherlock Holmes. Pero, ¿es su inteligencia extraordinaria una invención de la ficción o podemos aprender a desarrollar estas habilidades, para mejorar nuestras vidas en el trabajo y en casa? A través de ¿ Cómo pensar como Sherlock Holmes? , la periodista y psicóloga Ma […]
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  • Ágilmente - Estanislao Bachrach May 24, 2017
    Bachrach es Doctor en biología molecular y explica el funcionamiento del cerebro. A través de ello, da consejos y herramientas para ser más creativos y felices en el trabajo y en la vida. La neurociencia es clara: el cerebro aprende hasta el último día de vida. La creatividad puede expandirse. Tu mente, mediante la aplicación de las técnicas correctas, puede […]
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  • El cisne negro. Nueva edición ampliada y revisada - Nassim Nicholas Taleb May 24, 2017
    ¿Qué es un cisne negro? Para empezar, es un suceso improbable, sus consecuencias son importantes y todas las explicaciones que se puedan ofrecer a posteriori no tienen en cuenta el azar y sólo buscan encajar lo imprevisible en un modelo perfecto. El éxito de Google y You Tube, y hasta ell 11-S, son “cisnes negros”. Para Nassim Nicholas Taleb, los cisnes negr […]
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How to treat your vegetables like meat

Use these techniques to make veggies so good, even the meat-lovers will be salivating. […]

10 ethically made, eco-friendly backpacks

These lovely packs are made from upycled waste materials, biodegradable natural fabrics, recycled polyester, and more. […]

14 gorgeous mushrooms that show fungi’s glamorous side

Mushrooms are all too often relegated to the realm of dark and funky fungi, when in fact many are worthy of super-swooning. […]

The Electricity Lobby Was Behind the First National Christmas Tree Lighting

On Thursday night, President Barack Obama and First Lady Michelle Obama will flip the switch on 600 energy-efficient lights on the 30-ft.-tall Colorado Blue Spruce that is this year’s National Christmas Tree, in a festive ceremony featuring performances by singers James Taylor, Kelly Clarkson, Marc Anthony, and Garth Brooks and Trisha Yearwood. The annual tradition of lighting a national tree dates back to December 24, 1923, when President Calvin Coolidge pressed a button that lit up more than 2,500 light bulbs strung around a 60-ft.-tall balsam fir tree from his home state of Vermont—reportedly personally felled in “the heart of the Green Mountains” by Middlebury College’s President Paul D. Moody and shipped express to Washington by the school’s alumni. The Jan. 7, 1924, issue of TIME magazine described the sequence of events: “At 5 p. m. the President pressed a button, lighting the great National Christmas tree rising 60 feet high in the oval south of the White House. A choir from the Epiphany Episcopal Church and a brass quartet of the Marine Band gave a concert.” The write-up, however, also highlighted the discrimination of the time, as “the assembled multitude” first sang carols around 9:00 that evening, and a group of African-American singers were only able to hold their own segregated festivities later in the night. But the ceremony wasn’t started just to spread holiday cheer and Vermont pride. Library of CongressPresident Coolidge illuminating the community Christmas tree, which has been erected south of the White House. In fact, the brains behind the event hoped it would help spread electricity use throughout the country. Its mastermind, Frederick M. Feiker, assistant to the Secretary of Commerce Herbert Hoover and former technical journalist for General Electric (GE), described his light bulb moment to his daughter Janet a decade later in a March 8, 1932, letter: The Society for Electrical Development was interested to have as many people use electric lights at Christmas time as possible, so I thought of this idea of having the National Christmas Tree at Washington, which would stimulate other people to have outdoor Christmas trees. In order to get this started, we had to get the President of the United States to light the tree. If you get the President of the United States two years in succession to do a thing, he will always do it. So $5,000—that’s $70,680.99 in 2016 dollars—was collected to install underground lighting cables for the tree’s red, white and green bulbs. And living up to his nickname “Silent Cal,” Coolidge “refused to speak, but he did agree to push the button,” Feiker said. (He also nearly scuttled the 1924 ceremony with his reluctance to cut down a tree, but agreed to the idea if they used a living tree instead.) Get your history fix in one place: sign up for the weekly TIME History newsletter While the electrification of the country was underway well before 1923, the ’20s were the “tipping point decade,” as Amity Shlaes, author of Coolidge and chair of the board of the Calvin Coolidge Presidential Foundation, puts it. In 1920, 35% of homes had electricity, and by 1930, 68% did. The Economic History Association estimates that 70% of manufacturing activity relied on electricity by 1929, up from 30% in 1914. Urban homes and businesses were powered by electricity before many rural areas, many of which wouldn’t get access until the Rural Electrification Administration was created under the New Deal. Looking back, the 1923 tree lighting was also in sync with other trends in that period, historians say. “The 1920s were a decade of advertising, copywriters, punchy prose, tabloid journalism with splashier photography displays, so we’re getting this visual culture, and both [Presidents] Harding and Coolidge recognized the publicity value of a photo op,” says David Greenberg, author of Calvin Coolidge and a professor of History and of Journalism & Media Studies at Rutgers University. “So it’s easy to imagine the White House tree lighting ceremony was just sort of part of this proliferation of public events at which you get a nice photo in the newspaper for this kind of easy stunt.” Combine that trend with the glitzy Jazz Age, says historian David Pietrusza, author of several books on Coolidge, and the tree-lighting ceremony fits right in with “the Roaring Twenties—when everything about American society seem to glitter and flicker with a flame never before witnessed.” […]

You don’t need a skillet to cook fabulous eggs

Learn how to prepare this breakfast favorite using other tools in your kitchen. The results will amaze you. […]

Photo: Weedy seadragon hides in the sea weeds

Our photo of the day celebrates this ever-wonderful cousin of the seahorse. […]

Teach kids to love nature with ‘The Big Book of Nature Activities’ (book review)

Packed with information, activities, games, and tips on how to understand and engage with the natural world, this hefty book should be on every parent or teacher’s desk. […]