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  • ¿Cómo pensar como Sherlock Holmes? - Maria Konnikova November 17, 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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  • La teoría del todo - Stephen W. Hawking November 17, 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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  • La física del futuro - Michio Kaku November 17, 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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  • El cisne negro. Nueva edición ampliada y revisada - Nassim Nicholas Taleb November 17, 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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  • Sobre la teoría de la relatividad especial y general - Albert Einstein November 17, 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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  • Tricks Any Dog Can Do! - Susan Day November 17, 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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  • Ágilmente - Estanislao Bachrach November 17, 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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  • EnCambio - Estanislao Bachrach November 17, 2017
    EnCambio te va a permitir alumbrar los procesos por los cuales te comportás de determinada manera con el fin de dejar atrás aquellos hábitos y conductas que ya no te sirven. El objetivo es que aprendas del potencial que tiene tu cerebro para cambiar y la capacidad que tenés vos para modificarlo. Este año cambio de trabajo, empiezo el gimnasio, bajo esos kili […]
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  • Breve historia de mi vida - Stephen Hawking November 17, 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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  • Física General Esencial - Agustín Vázquez Sánchez November 17, 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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California Today: California Today: Talking to the Creator of ‘Snowfall’

California Online (Please note: We regularly highlight articles on sites that have limited access for nonsubscribers.) Photo Representative Brad Sherman listened as James B. Comey, the former F.B.I. director, testified on Capitol Hill last month. […]

Buzz Aldrin: ‘Planet 9’ Proves How Important Space Exploration Is

The recent big news in space is that our solar system seems to be bigger than we thought. Evidence for a giant planet lurking far away from our sun in the murky and cold real estate of the outer solar system is enlightening—arguably for good and bad reasons. I’m reminded of an axiom we’re all familiar with: objects in the rearview mirror may appear closer than they are. But in this case the nicknamed “Planet 9” may be more in our face than we realize. Planet 9 is a should-be-there world. That is, nobody has yet spotted the object directly. But thanks to mathematical modeling and computer simulations, this distant world could have a mass about 10 times that of Earth. If truly a resident of our neighborhood of planets, this supposed planet would make one full orbit around the sun that takes between 10,000 and 20,000 years. Given that a few years ago we demoted Pluto from its planet status, the claim of a “Planet 9” adds up to one fact: the planetary census of our solar system is clearly unfinished business. That’s what space exploration is all about—defining new boundaries. A potential new planet offers great satisfaction for those of us who look for things out there. The good news is that we finally have the ability to detect large objects remote from our home planet. But “Planet 9” is also a reminder of all the solar system’s unknowns, which include asteroids that could hit Earth. NASA recently formed a Planetary Defense Coordination Office to coordinate U.S. agencies and intergovernmental efforts to respond to future near-Earth objects that threaten Earth. Evidence for a possible additional planet is sign we must stay vigilant. As the world discusses the potential of “Planet 9,” I’ve just begun my 86th trip around the sun—a birthday celebration made all the more meaningful by recently forming the Buzz Aldrin Space Institute at the Florida Institute of Technology in Melbourne, where we’re developing a complete plan for the future called Cycling Pathways to Occupy Mars. Gaining that foothold is prerequisite, I believe, to furthering humanity’s advances ever-deeper into the solar system. It’s a big universe out there. The prospective “Planet 9” in our own backyard reminds us of that—and assuredly more surprises are in the offing. Buzz Aldrin, best known for his Apollo 11 moonwalk, holds a doctoral degree in astronautics and continues to wield influence as an international advocate of space science and planetary exploration. Aldrin and co-author, Leonard David, wrote Mission to Mars – My Vision for Space Exploration, published in 2013 by the National Geographic Society. Aldrin’s new children’s book, Welcome to Mars: Making a Home on the Red Planet, co-authored with Marianne Dyson, is available in September. […]

Buzz Aldrin: ‘Planet 9’ Proves How Important Space Exploration Is

The recent big news in space is that our solar system seems to be bigger than we thought. Evidence for a giant planet lurking far away from our sun in the murky and cold real estate of the outer solar system is enlightening—arguably for good and bad reasons. I’m reminded of an axiom we’re all familiar with: objects in the rearview mirror may appear closer than they are. But in this case the nicknamed “Planet 9” may be more in our face than we realize. Planet 9 is a should-be-there world. That is, nobody has yet spotted the object directly. But thanks to mathematical modeling and computer simulations, this distant world could have a mass about 10 times that of Earth. If truly a resident of our neighborhood of planets, this supposed planet would make one full orbit around the sun that takes between 10,000 and 20,000 years. Given that a few years ago we demoted Pluto from its planet status, the claim of a “Planet 9” adds up to one fact: the planetary census of our solar system is clearly unfinished business. That’s what space exploration is all about—defining new boundaries. A potential new planet offers great satisfaction for those of us who look for things out there. The good news is that we finally have the ability to detect large objects remote from our home planet. But “Planet 9” is also a reminder of all the solar system’s unknowns, which include asteroids that could hit Earth. NASA recently formed a Planetary Defense Coordination Office to coordinate U.S. agencies and intergovernmental efforts to respond to future near-Earth objects that threaten Earth. Evidence for a possible additional planet is sign we must stay vigilant. As the world discusses the potential of “Planet 9,” I’ve just begun my 86th trip around the sun—a birthday celebration made all the more meaningful by recently forming the Buzz Aldrin Space Institute at the Florida Institute of Technology in Melbourne, where we’re developing a complete plan for the future called Cycling Pathways to Occupy Mars. Gaining that foothold is prerequisite, I believe, to furthering humanity’s advances ever-deeper into the solar system. It’s a big universe out there. The prospective “Planet 9” in our own backyard reminds us of that—and assuredly more surprises are in the offing. Buzz Aldrin, best known for his Apollo 11 moonwalk, holds a doctoral degree in astronautics and continues to wield influence as an international advocate of space science and planetary exploration. Aldrin and co-author, Leonard David, wrote Mission to Mars – My Vision for Space Exploration, published in 2013 by the National Geographic Society. Aldrin’s new children’s book, Welcome to Mars: Making a Home on the Red Planet, co-authored with Marianne Dyson, is available in September. […]

Hong Kong Protests Reach Violent High as Students Clash with Police Overnight

Hong Kong’s pro-democracy protests descended into the worst violence seen so far early Monday, as demonstrators ended more than two months of largely peaceful civil disobedience with a dramatic escalation in tactics. Thousands of protesters clashed with police overnight at the demonstration’s main encampment near government headquarters in well-heeled Admiralty district, at one point storming into a main thoroughfare and bringing evening traffic to a sudden stop. Police in riot gear fought back with a liberal use of batons and pepper spray, hurling protesters to the ground to make arrests. At least 40 people were hospitalized in the bedlam. The night marked a major reversal in direction for what student leaders have long maintained was a movement principled in non-violence. Student groups, who bristle at the Chinese government’s insistence on vetting candidates for Hong Kong’s top political leader, have urged protesters to show their readiness for the right to free elections by exercising restraint. But months of waiting in the streets for an increasingly unlikely turnaround from either Beijing or the Hong Kong government, as well as seething anger at perceived police brutality, appear to have sharpened protesters’ ambitions. “I think we’ve had enough,” said Doug Lee, 20, a musician, on Monday morning. “I’m ready to fight, ready to protect our people, ready for revolution.” Speaking over a megaphone on Sunday night, two of the student leaders, Nathan Law and Oscar Lai, called for assembled protesters to surround the government offices and prevent employees from getting to work in the morning. Yet leaders gave little direction as to what should happen in the hours between their speeches and the start of the new working week. “There is no plan,” said one protester, first-named Danny, as he stood at one entry to the headquarters. The 20-year-old insisted, though, that he at least knew that protesters would not charge at police and would remain peaceful. Yet just minutes later, a group of protesters in helmets, goggles and face masks counted down and charged at police lines near Tamar Park, a swath of green hemmed by skyscrapers and lights wishing “seasons greetings” to this freewheeling metropolis of seven million. A second group of demonstrators charged at police blocking access to nearby Lung Wo Road, and protesters surged while cheering and clapping into the key thoroughfare. Umbrellas were passed hand to hand toward the frontline as protesters, reeling from pepper spray and bloodied by batons, were hurried out of the crowd and passed to medics. Protesters linked hands to surround wounded demonstrators and form the most makeshift of hospitals on the grass. One volunteer medic, Shane Lee, 21, said that he had treated at least 30 people overnight, including four head wounds and an arm fracture. As the confrontations intensified, with police forcing protesters out of Lung Wo Road overnight, government employees were told they did not have to report to work. By morning, intermittent clashes between protesters and police continued, with protesters showing a visible anger not seen before at a camp where protesters spend most of their time tapping at smartphones, studying, and passing around cakes and noddle dishes. In some instances, protesters threw water bottles at cops and raised middle fingers amid raucous jeers. Police also heckled protesters, tearing down their banners calling for real democracy, and it at times became unclear who was aggressing on whom. Police say they made 40 arrests overnight. “Why would Hong Kong police do that,” said one man, surnamed Tam, a 30-year-old hairdresser who said he had been hit several times with a baton. Protesters in Admiralty district had over the last few weeks entered a period of reckoning after Hong Kong’s political leaders had shut down any possibility of future talks with student groups. Student leaders’ plans to take their demands to Beijing ended at Hong Kong’s airport, when the Chinese government revoked their permits to visit Mainland China. Meanwhile, polls put public support for the street occupations on the decline. Questions about the future of the movement became all the more potent when police acted on an injunction brought by transport companies frustrated by the traffic disruption and cleared a virulent satellite protest site across the iconic Victoria Harbor in Kowloon’s raffish Mong Kok district. Joshua Wong, a student protest leader, defended the evening of tumult in a Facebook post, saying that “students [were] forced to take this step,” after all other options were exhausted and after weathering months of police violence. Seven cops were arrested this week for the alleged beating of a protester during an earlier attempt to occupy Lung Wo Road, and local journalist groups have filed complaints at police headquarters over the violent arrest of two reporters covering protests in Mong Kok. Protesters have on recent nights convened in the neighborhood to — they insist — “go shopping” or wait for a bus, bringing traffic to an almost comic standstill as police chaff at protesters “cross[ing] the roads” slowly. “Students occupy peacefully, but are faced with police violence,” wrote Wong, who has accused police of assaulting him, including punching him and touching his groin, during his arrest in Mong Kok earlier this week. Hong Kong Secretary for Security Lai Tung-kwok denied the police used excessive force. “Batons and bricks were found in the bags of the protesters,” he told reporters. Lam Cheuk-ting, Chief Executive of the Democratic Party, said that student leaders had not discussed their plans to surround government headquarters with either the pro-democratic legislators or the leaders of Occupy Central, the group that originally called for pro-democracy sit-ins here but later ceded the face of the protests to two student groups. “I understand why they don’t retreat because the government hasn’t responded to our demands, any of the demands,” he tells TIME. “But we all know that if the deadlock continues we will gradually lose support from the public.” On Monday morning, as the tumult eased into a tense calm, protesters were determined to keep fighting, yet uncertain where it would get them. Meanwhile, a group of British MPs have been refused access to Hong Kong where they intended to investigate the relationship the U.K. has with its former colony. British nationals do not normally need visas for Hong Kong, which has enjoyed significant autonomy from Beijing under a principle of “one country, two systems” since it was handed back to China in 1997. Sir Richard Ottoway, who chairs the Foreign Affairs Committee, accused Beijing authorities of acting in an “overtly confrontational manner.” Such accusations are becoming all too common as this battle for Hong Kong’s future builds to a indecorous crescendo. —With reporting by Per Liljas, Helen Regan, Rishi Iyengar and David Stout / Hong Kong […]

Hong Kong’s Protesters Don’t Need the Internet to Chat With One Another

If you’ve ever been crammed into a stadium alongside thousands of screaming football or music fans, you already know what the tens of thousands of demonstrators pouring into Hong Kong’s this week are learning: When you pack that many people into a tiny area, your phone’s Internet grinds to a halt. Smartphones should make it easier to organize protests, but they’re as good as bricks when cell towers get overloaded with traffic or when governments decide to flip the switch. Hong Kong has seen both of these happen: Thousands of people on the street means mobile Internet is useless in packed areas, while Chinese authorities are blocking Instagram on the mainland, favored by Chinese dissidents because it was one of the few social networks not blocked in the country. In the face of these hangups, Hong Kong’s demonstrators have turned to FireChat, a smartphone app that allows users to communicate even when they can’t get online or send texts. Unlike chat programs that work over the Internet, FireChat connects directly to other nearby users within up to about 250 feet. More people in range can then join the chat, extending the network even further. Pretty soon you can get up to a few thousand people chatting away, all without anybody connected to the Internet. FireChat is based on mesh networking, in which every device on a network works as a node for expanding that network. The idea’s been around for decades, now popular as a way to communicate during disasters like hurricanes. But Hong Kong shows it’s useful during civil disobedience, too. Some 200,000 people there downloaded the app between Sunday and Tuesday, said Micha Benoliel, CEO of Open Garden, the company behind FireChat, sending it skyrocketing to the top of the region’s app store charts. Speaking from Hong Kong, Benoliel told TIME FireChat’s sudden popularity there isn’t a “complete surprise” because it was also popular with Taiwanese protesters last March. It’s also the latest in a long line of technologies that helped fuel wide-scale protests. Iran’s 2009 Green Revolution was dubbed the “Twitter Revolution” thanks to protesters’ penchant for organizing via Twitter, likewise 2011’s Occupy Wall Street was a hashtag before it was a street protest. Facebook and YouTube, meanwhile, have brought us to the front lines of the Arab Spring and Syria’s long-fought civil war, even being used as recruiting tools by anti-government rebels and jihadi groups. Where Twitter, Facebook and YouTube all fall short, however, lies in their need for an Internet connection to work — not the case for FireChat. Still, FireChat isn’t perfect for protesters. The chat rooms are open, making it easy for a first-timer to join — but that first-timer could also be a local authority poking around at the goings-on. However, Benoliel said the company is working on protester-minded updates like private messaging and encryption, as Open Garden advocates for “freedom of speech and access to information.” “If this application can help in this way, it’s very aligned with the mission of the company,” Benoliel said. “[FireChat] hasn’t been built for that purpose, but if it can help people in that situation, we are very supportive of what’s happening here in Hong Kong.” […]

Thousands Shut Down Central Hong Kong to Demand Democracy

Updated: Sept. 28, 2014, 4:49 a.m. E.T. Thousands of pro-democracy demonstrators thronged government headquarters in central Hong Kong Sunday, kicking off a civil disobedience movement that seeks to achieve a popular vote for the city’s top job by paralyzing the heart of this freewheeling financial hub. Occupy Central with Peace and Love, as the moment is officially know, was originally stated to begin Wednesday, but an aligned student demonstration Friday gathered such momentum that its leaders brought the timing forward. “We want to help the students achieve their goals,” Benny Tai, a founder of Occupy Central, told TIME on Sunday morning, of the early start to the group’s campaign. “They want to stay here, and we want to support them.” Hong Kong has been run under a “one country, two systems” since British colonial rule ended in 1997. Beijing had promised to let residents choose the city’s Chief Executive, the tellingly corporate title of the top job in this bastion of free enterprise, by 2017, but now insists that all candidates must first be vetted by a committee perceived as curated by the Chinese Community Party. Hong Kong’s democracy activists see this as a betrayal; Beijing retorts that the Special Administrative Region already enjoys considerable autonomy and lacks patriotism. Current Chief Executive CY Leung, a polarizing figure largely seen as loyal to the mainland, told reporters Sunday that Hong Kong was “not a self-contained democracy.” “Any fair-minded person will come to the conclusion that the method of electing the Chief Executive in 2017 is more democratic,” he said. “It is not ideal, but it is better.” On Saturday, a public square attached to the government headquarters was stormed by students, and at least 74 people were arrested. That protest swelled to upwards of 50,000 people, according to organizers, congregating in the austere, concrete flanking areas. Hong Kong Police Commissioner Andy Tsang Wai-Hung defended his officers’ handling of the student protests when speaking with media Sunday. “Even after considering the protesters were unarmed, I believe it is important to consider that many otherse were injured as a result of their acts,” he said. By Sunday, protest numbers had dwindled to a few thousand, but tense standoffs between police and protesters continued across barricades, occasionally escalating into skirmishes. In the afternoon, several democratic legislators were arrested for “obstructing police in the detainment of audio equipment” at one of the steel barriers, according to the Hong Kong Student Federation. That same organization donned black T-shirts with the English phrase, in green letters, “Freedom Now!” Layla chang, an 18-year-old university student, said she didn’t feel she could leave the main protest site even if she tried, since the police had blocking all entrances and exits, and the throngs have amassed to intractable numbers outside. “We are very afraid but we can’t leave now,” she said. But the sprawl still retained a typically Hong Kong sense of order, with volunteers organizing the collection and sorting of waste, and medical groups erecting tents to treat protestors for exhaustion and pepper spray. Plastic wrap, to guard against the latter, was doled out by the protest organizers. In a surreal scene, at a park just a few hundred yards from the protests, a small group of elderly folk listened to mandarin songs celebrating the coming 65th anniversary of the founding of the People’s Republic of China. Audrey Eu, chairman of the Civic Party, a leading democratic party in Hong Kong, told TIME that though she thought it “unlikely” Beijing would reverse its position on the 2017 elections, the protests would go a long way toward galvanizing pro-democracy sentiment and heralding future change. “This is a broad-based movement,” she said. “The people of Hong Kong need to stand up and defend one country, two systems,” she said by a police barricade, protective ski goggles perched on her head. She had brought her sleeping bag for a possible “long wait.” On Sunday morning, protesters caught quick naps under the shade of blue and red tents and hunted for snacks in the piles of bread, bananas, cookies and water that volunteers had dropped off. Demonstrators wound yellow ribbons, a longstanding symbol of demands for universal suffrage, around police barricades. At one barrier, dozens of umbrellas were fanned to protect against the potential use of pepper spray, which had been deployed by police the previous day. “I’m prepared to be arrested,” Jimmy Lai, a prominent Hong Kong publisher and critic of the Beijing government, told reporters, as he sat down in front of a row of police on Sunday morning, wearing a plastic white raincoat and pair of goggles. “If you persist in resistance, there is always hope,” he told TIME. “If you give up, there is no hope.” Gemma Yim, 21, a university student sitting behind Lai, said she was not prepared to go home anytime soon and would stay at least until all those demonstrators arrested Saturday were released. “We just want to go step by step,” she said. “Right now, I don’t know what we can do but go on strike.” —With reporting by Zoher Abdoolcarim/Hong Kong, David Stout/Hong Kong and Rishi Iyengar/Hong Kong […]

Keystone XL: An Environmental Triple Whammy

“This we know: the earth does not belong to man; man belongs to the earth. Man did not weave the web of life; he is merely a strand in it. Whatever he does to the web, he does to himself.” — Chief Seattle, 1854 On January 31, the Department of State issued its environmental assessment of TransCanada’s proposed Keystone XL (KXL) pipeline. If built, the KXL will transport petroleum from Canada’s Alberta tar sands to a neighborhood near you. At least that’s the hype. The safe bet is that the oil will be sold to the highest bidder — probably the Chinese — benefiting no one in North America save for a few oil magnates, yet subjecting heartland America to the pipeline’s environmental hazards. Buried deep within State’s executive summary, in the section titled “Climate Change Effects,” is the seemingly almost innocuous statement: ” … during the… operational time period, the following climate changes are anticipated to occur regardless [emphasis added] of any potential effects of the proposed Project: warmer winter temperatures; a shorter cool season; a longer duration of frost-free periods; more freeze-thaw cycles per year; warmer summer temperatures; increased number of hot days; and longer summers.” Translation: By our fossil-fuel addiction, we’ve already put the climate at risk, so why sweat another pipeline […]