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  • Sobre la teoría de la relatividad especial y general - Albert Einstein August 18, 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 August 18, 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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  • Física General Esencial - Agustín Vázquez Sánchez August 18, 2017
    La nueva edición del ebook contiene ahora ocho temas completos de física y una sección de prácticas para realizar en casa. Se han corregido errores y agregado más ejemplos y ejercicios además de recursos multimedia en todos los capítulos.  Los ejemplos resueltos se presentan paso a paso a través de una solución algebraica con lo cual se evitan errores n […]
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  • Tricks Any Dog Can Do! - Susan Day August 18, 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 August 18, 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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  • Ágilmente - Estanislao Bachrach August 18, 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 gran diseño - Stephen Hawking & Leonard Mlodinow August 18, 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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  • Breve historia de mi vida - Stephen Hawking August 18, 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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  • Una mochila para el universo - Elsa Punset August 18, 2017
    ¿Cuánto debe durar un abrazo? ¿De qué sirve llorar? ¿Qué podemos hacer para cambiar nuestra suerte? ¿Tiene algún propósito el enamoramiento? ¿Y por qué es tan inevitable el desamor? ¿Cómo aprendemosa tener miedo? ¿A partir de qué edad empezamos a mentir? ¿Por qué sentimos envidia? ¿Cuántos amigos necesitamos para ser felices? ¿Podemos evitar estresarnos sin […]
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  • ¿Cómo pensar como Sherlock Holmes? - Maria Konnikova August 18, 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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Police Brace for More White Nationalist Rallies, but Have Few Options

Mayor Walsh said that Boston wanted to discourage the rally’s organizers from coming, and that William B. Evans, the police commissioner, was developing a plan to keep the rally and any counterdemonstrations separate. By late Monday, it appeared that some of the billed speakers were backing out.But if there is a rally, unlike the authorities in Charlottesville, officials in Boston will probably not be forced to confront a large number of armed protesters because Massachusetts allows only those with a gun license to openly carry a firearm. In Virginia, no license is required for those over 18.In South Carolina, where there were dozens of protests related to the removal of the Confederate battle flag from government buildings, firearms are prohibited from the State Capitol grounds. Leroy Smith, the state director of public safety, said that intense anger over such issues combined with the presence of firearms would have been a toxic mix.“With the added element of open carry, it creates more of a challenge for law enforcement officers because usually when you see a weapon and that person is not a law enforcement officer, you know you need to defuse the situation,” he said.Many urban police chiefs have opposed open-carry laws, even in states where people feel fiercely protective of their gun rights.John Eterno, a former training instructor with the New York Police Department who now teaches at Molloy College, said the presence of weapons combined with the unexpectedly large crowds in Charlottesville might have thrown off that city’s planning. When people have the right to carry firearms, the police must balance caution with respect, he said. Officers can do little more than check the person’s demeanor for signs of aggression and monitor whether the firearm is properly holstered.The Charlottesville police have faced a hailstorm of criticism from protesters and counterprotesters alike […]

Trump Doubles Down on Threats Against North Korea as Nuclear Tensions Escalate

Mr. Trump made his latest comments on North Korea during a pair of televised media events that covered a dizzying array of topics. He assailed Senator Mitch McConnell, the Republican leader, for not passing his legislative priorities, calling it “disgraceful” that the party’s health care plan failed by one vote and hinting that the leader should step down if he cannot do better. Mr. Trump also said he would declare the opioid epidemic a national emergency and defended his decision to bar transgender people from the armed forces, saying he was “doing the military a great favor.”In his first response to Russia’s decision to force the United States to slash its diplomatic staff in half, the president said he would thank President Vladimir V. […]

In Breakthrough, Scientists Edit a Dangerous Mutation From Genes in Human Embryos

“We’ve always said in the past gene editing shouldn’t be done, mostly because it couldn’t be done safely,” said Richard Hynes, a cancer researcher at the Massachusetts Institute of Technology who co-led the committee. “That’s still true, but now it looks like it’s going to be done safely soon,” he said, adding that the research is “a big breakthrough.”“What our report said was, once the technical hurdles are cleared, then there will be societal issues that have to be considered and discussions that are going to have to happen. Now’s the time.”Scientists at Oregon Health and Science University, with colleagues in California, China and South Korea, reported that they repaired dozens of embryos, fixing a mutation that causes a common heart condition that can lead to sudden death later in life.If embryos with the repaired mutation were allowed to develop into babies, they would not only be disease-free but also would not transmit the disease to descendants.The researchers averted two important safety problems: They produced embryos in which all cells — not just some — were mutation-free, and they avoided creating unwanted extra mutations.“It feels a bit like a ‘one small step for (hu)mans, one giant leap for (hu)mankind’ moment,” Jennifer Doudna, a biochemist who helped discover the gene-editing method used, called CRISPR-Cas9, said in an email.Gene Editing in EmbryosScientists tried two techniques to remove a dangerous mutation. In the first, genetic “scissors” were inserted into fertilized eggs. The mutation was repaired in some of the resulting embryos but not always in every cell. The second method worked better: By injecting the “scissors” along with the sperm into the egg, more embryos emerged with repaired genes in every cell.FIRST TECHNIQUEWhen gene-editing components were introduced into a fertilized egg, some embryos contained a patchwork of repaired and unrepaired cells.Gene-editingcomponents insertedafter fertilizationCell withunrepairedgeneMaternal DNAMutationSpermPaternal DNACell withrepairedgeneOocyteFertilized cellMosaicism inlater-stage embryoNEW TECHNIQUEWhen gene-editing components were introduced with sperm to the egg before fertilization, more embryos had repaired mutations in every cell.Gene-editing componentsinserted together with sperm,before fertilizationIn 42 of 58embryostested, allcells wererepairedUniformlater-stage embryoFIRST TECHNIQUEWhen gene-editing components were introduced into a fertilized egg, some embryos contained a patchwork of repaired and unrepaired cells.Gene-editingcomponents insertedafter fertilizationMaternal DNAMutationPaternalDNASpermOocyteFertilizedcellCell withunrepairedgeneCell withrepairedgeneMosaicism inlater-stage embryoNEW TECHNIQUEWhen gene-editing components were introduced with sperm to the egg before fertilization, more embryos had repaired mutations in every cell.Gene-editingcomponents insertedtogether with sperm,before fertilizationIn 42 of 58embryostested, allcells wererepairedUniformlater-stage embryo“I expect these results will be encouraging to those who hope to use human embryo editing for either research or eventual clinical purposes,” said Dr. Doudna, who was not involved in the study.Continue reading the main storyMuch more research is needed before the method could be tested in clinical trials, currently impermissible under federal law. But if the technique is found to work safely with this and other mutations, it might help some couples who could not otherwise have healthy children.Potentially, it could apply to any of more than 10,000 conditions caused by specific inherited mutations. […]

Forty Years’ War: Kennedy’s Battle in the Nation’s War Against Cancer

The story of Mr. Kennedy’s battle with glioblastoma is one that raises questions of hope and reality and of how much the health care system should pay for hope. As has happened with most cancers in the nation’s 40-year war on cancer, progress on glioblastomas has been incremental. With these deadly brain cancers in particular, the disease remains poorly understood. And even though many patients, like Mr […]

‘Plan C’ on Obamacare, Repeal Now and Replace Later, Has Collapsed

“It will be a lot easier,” Mr. Trump said, adding, “We’re not going to own it. I’m not going to own it. I can tell you the Republicans are not going to own it. We’ll let Obamacare fail and then the Democrats are going to come to us.”Continue reading the main storySenator Mitch McConnell of Kentucky, the majority leader, gamely pressed forward on Tuesday even as the ground was giving way beneath him.“I regret that the effort to repeal and immediately replace the failures of Obamacare will not be successful,” Mr. McConnell said on the Senate floor on Tuesday morning. “That doesn’t mean we should give up. We will now try a different way to bring the American people relief from Obamacare. I think we owe them at least that much.”On Capitol Hill, Republicans and Democrats alike were trying to make sense of the bill’s downfall — and what comes next […]

Governors Give Chilly Reception to Health Bill Push

The timing is critical because the Senate is expected to take up its health care overhaul this week, and Republicans — who control the body with a slim 52-vote majority — have already lost the support of two of their senators. Losing one more Republican senator would effectively sink the legislation, and a handful of Republican senators from states that have expanded Medicaid under the Affordable Care Act have signaled they will closely follow the lead of their state’s governor.Continue reading the main storyAt a private luncheon for governors on Saturday, three Democratic governors called for the group to release some sort of joint, bipartisan statement on the health bill. Gov. Dannel P. Malloy of Connecticut proposed a letter formally opposing the Senate legislation, while Gov. Terry McAuliffe of Virginia, the chairman of the National Governors Association, and Gov. Steve Bullock of Montana suggested a more restrained approach that would communicate their unease with the measure. But a handful of Republican governors opposed making a collective statement, noting there was no broad agreement about the nature of their opposition.“It’s important if anything goes out under the name of the N.G.A. that it has the endorsement of members certainly, and I think there was not consensus on that,” Gov. […]

Economic Scene: Trump’s Trade Choice: Follow the Postwar Order or Blow It Up

A lot of this may look tame when set alongside Mr. Trump’s fiery campaign speeches portraying trade as the bane of the American worker. He no longer calls for a 45 percent tariff on imports from China, nor does he threaten to walk away from Nafta.Continue reading the main storyDespite his campaign promises to voters in industrial states eager for protectionism, some analysts suggested that Mr. Trump might ultimately be hemmed in by the standard pro-trade orthodoxy of the Republican Party.But the relative moderation of the administration’s recent trade initiatives is hardly reassuring. It’s not just that many of his proposals will invite retaliation from the nation’s trading partners — inviting the prospect of a protracted tit-for-tat trade war. The most frightening aspect of Mr. Trump’s approach is the seeming contempt for the rules and institutions that have underpinned global trade since World War II.Might Mr […]