Novedades del último mes en eBooks de Estudios generales

Los Elementos de Euclides es una de las escasísimas obras antiguas que puede presumir de haber constituido, casi de golpe, la base sobre la que se ha levantado toda una ciencia, en este caso la geometria y la aritmetica, al menos desde el siglo III a. C. hasta el siglo XIX. La razon de su prolongado exito radica en sus grandes virtudes expositivas y didacticas, asi como en su afan de sistematizacion deductiva.Gredos publica esta obra completa de Euclides en tres volumenes y en una exhaustiva edicion critica. Este segundo tomo incluye los libros V-IX, en los cuales se trata la teoria generalizada de la proporporcion y la teoria aritmetica.

La historia del conocimiento humano está repleta de nombres, acontecimientos e ideas increíbles, y nunca más cierto cuando hablamos de una de las disciplinas que más han revolucionado el mundo científico en los ultimos siglos: la biologia. Consuelo Cuevas da cuenta de las disputas que esta ciencia suscito en Mexico, tanto en los laboratorios como en las aulas, las principales figuras que intervinieron en su desarrollo, sus centros de investigacion en el pais y muchas de las grandes aportaciones que la biologia ha hecho al pueblo mexicano desde la epoca del Porfiriato hasta finales del siglo xx.

Los Elementos de Euclides es una de las escasísimas obras antiguas que puede presumir de haber constituido, casi de golpe, la base sobre la que se ha levantado toda una ciencia, en este caso la geometria y la aritmetica, al menos desde el siglo III a. C. hasta el siglo XIX. La razon de su prolongado exito radica en sus grandes virtudes expositivas y didacticas, asi como en su afan de sistematizacion deductiva.Gredos publica esta obra completa de Euclides en tres volumenes y en una exhaustiva edicion critica. En este primer tomo (libros I-IV), el matematico griego desarrolla la teoria de la geometria plana.

A rigorous yet accessible exploration of the principles of reasoning, this work invites the reader to master the art of the syllogism through interactive challenges. By stripping logic of its dry academic reputation, the author turns the mechanics of thought into a compelling intellectual adventure. It is an essential guide for anyone looking to sharpen their mind while enjoying the elegance of structured deduction.

Transforming the complexities of formal logic into an engaging pastime, this book introduces a board game designed to teach the rules of clear thinking. Through the use of counters and diagrams, the reader learns to navigate the pitfalls of fallacious reasoning and embrace the clarity of valid arguments. It is a masterful example of how education can be seamlessly integrated with entertainment and play.

You see someone yawn. Within seconds, your jaw stretches, your eyes water, and you are forced to do the exact same thing. Contagious yawning is one of the most universal and uncontrollable human behaviors, yet for centuries, medical science dismissed it as a simple reflex for oxygen intake. Today, neurologists recognize it as a profound window into the evolution of human empathy.Studies show that contagious yawning is deeply linked to the brains mirror neuron systemthe same network responsible for our ability to feel compassion and understand the emotions of others. Psychopaths and those with severe antisocial disorders are notably immune to it. Furthermore, the yawn acts as an evolutionary thermoregulator, cooling the brain to maintain peak alertness within a social group during times of shared fatigue.This fascinating exploration blends evolutionary biology and modern neuroscience to decode the hidden language of the body. It reveals how an involuntary physical spasm serves as an invisible thread binding our social groups together, proving that our capacity to connect with one another is hardwired into our most primal reflexes.

For over a century, the neuron has been the undisputed star of neuroscience. Every textbook taught that these electrical wires were solely responsible for our thoughts, memories, and consciousness. Meanwhile, glial cellswhich make up more than half of the human brainwere dismissed as mere "glue" (the literal translation of glia), serving only as passive support structures for the much more important neurons.Recent breakthroughs in cellular biology have shattered this dogma. We now know that glial cells, particularly astrocytes, are the active architects of our cognitive network. They do not just support neurons; they direct them. Glial cells decide which synaptic connections are strengthened during learning, which are pruned away, and how the brain repairs itself after physical trauma. They are the chemical conductors of the electrical symphony of the mind.This groundbreaking book journeys into the forgotten half of the human brain. It explores how shifting our focus from neurons to the glial network is revolutionizing our understanding of memory, learning, and neurological diseases like Alzheimers, proving that the brains true genius lies in its quietest cells.

Look at a map of global conflict zones, critical mineral deposits, and primary shipping routes. What seems like modern political strategy is actually a script written hundreds of millions of years ago. The wealth of modern nations was predetermined by the violent tearing apart of the ancient supercontinent known as Gondwana.Fractured Earth bridges the massive gap between prehistoric geology and modern geopolitics. The book explains how the specific ways tectonic plates ripped apart left massive, uneven deposits of oil, lithium, copper, and rare earth metals. These geological lotteries created the foundation for 21st-century economic dominance and supply chain vulnerabilities.Through deep geological history, you will understand why certain South American and African coastlines are mirror images rich in identical resources, and how the ancient collisions that formed the Himalayas are directly linked to todays semiconductor manufacturing constraints.Uncover the ultimate root cause of global wealth disparity. By understanding the deep mechanics of continental drift, you will never look at a world map, a geopolitical crisis, or the battery in your smartphone the same way again.

Society frequently frames crying as a loss of emotional control, a sign of weakness, or a useless biological reflex. We are taught to hold our tears back, apologizing when they spill over, completely misunderstanding the brilliant biochemical mechanism occurring in our bodies.Science reveals that not all tears are created equal. While basal tears lubricate the eye and reflex tears flush out dust, emotional tears contain a radically different chemical composition. When we cry from grief or joy, our bodies physically excrete massive amounts of stress hormones and natural painkillers, literally weeping away physiological anxiety.The Chemical Release explores the unique evolutionary biology of human crying. It explains how shedding tears is not a breakdown, but rather a highly sophisticated somatic healing process designed to rapidly down-regulate the nervous system and trigger deep social bonding among humans.Change the way you view your own emotions. Learn how suppressing tears actively harms your physical health, and discover why embracing this powerful biological release valve is the key to restoring internal balance and overcoming intense psychological stress.

Discover the laws that govern the universe.Written by the legendary scientist Isaac Newton, The System of the World presents the revolutionary ideas that changed humanitys understanding of motion, gravity, and the structure of the cosmos.In this remarkable work, Newton explainsclearly and methodicallythe principles behind planetary motion, gravitational force, and the mathematical laws that shape our physical reality. His insights laid the foundation for classical physics and influenced centuries of scientific discovery.Inside, youll explore:The universal law of gravitationThe mechanics governing celestial bodiesThe scientific reasoning that transformed astronomyThe principles that continue to shape modern scienceCelebrated as one of the most important scientific texts ever written, Newtons work remains essential reading for students, scholars, and anyone fascinated by the mysteries of the universe.Add this cornerstone of scientific thought to your digital library today and experience the brilliance that redefined our world.

Close your eyes and touch your nose. You can do it because of proprioceptionthe bodys internal sense of position. But at age 19, Ian Waterman lost this sense completely due to a rare viral infection. He became a "rag doll," unable to stand, sit, or even hold a cup, despite having healthy muscles. He had lost his body.In the tradition of Oliver Sacks, this book tells the inspiring story of how Ian taught himself to move again by using his eyes to replace his nerves. He has to consciously watch every limb to move it. It is a profound exploration of the "sixth sense" that grounds us in reality, and what happens when the connection between mind and flesh is severed.

On August 21, 1986, the farmers around Lake Nyos in Cameroon went to sleep in a silent valley. By morning, every living thing1,746 people, 3,500 livestock, even the flieswas dead. There was no fire, no flood, and no violence. The killer was the lake itself.This book investigates the terrifying phenomenon of a limnic eruption, where a lake "burps" a massive cloud of carbon dioxide, displacing oxygen and drowning a valley in invisible gas. It follows the scientific detective story to understand the event, the race to degas the lake before it strikes again, and the geological ticking time bombs hiding in crater lakes around the world. A gripping look at how the earth breathes, and sometimes, holds its breath too long.

In 1991, eight "biospherians" were sealed inside a three-acre glass terrarium in the Arizona desert. Biosphere 2 contained a rainforest, an ocean, and a savannah. It was meant to prove that humans could colonize Mars. Instead, it proved how little we understand Earth. Oxygen levels plummeted, crops failed, the crew split into warring factions, and crazy ants exterminated the other insects."The Glass World" documents the most ambitious ecological experiment in history. It details the scientific hubris, the psychological strain of isolation, and the humbling realization that we cannot engineer a replacement for nature. A crucial read for the climate change era, showing that "Planet B" is much harder to build than we think.

In 1953, a young man named Henry Molaison underwent experimental surgery to cure his epilepsy. The doctor removed his hippocampus. The seizures stopped, but so did time. For the rest of his life, Henry lived in a permanent present, his memory resetting every 30 seconds. He could meet you, shake your hand, and forget you before you sat down.Known to science as "Patient H.M.," Henry became the most studied human brain in history. This book tells his poignant life story and how his tragedy proved that memory is not a single filing cabinet, but a complex network of systems. He couldnt remember doing a puzzle, yet his hands learned how to solve itproving that the body remembers even when the mind forgets.

While Americans looked up to the moon, the Soviets looked down. In the frozen wastes of the Kola Peninsula, they spent 20 years drilling the deepest hole in history. The goal was the mantle. They reached 12,262 meters (7.6 miles) before the laws of physics stopped them.This book documents the engineering marvel of the Kola Superdeep Borehole. It debunks the urban legend that they "heard the screams of hell," but the scientific reality was stranger: At that depth, rock behaves like plastic, and water exists where it shouldnt. It is a story of extreme engineering, Cold War rivalry, and the crushing heat that protects the Earths secrets.

THIS book contains twelve stories of great inventions, with a concluding chapter on famous inventors of today. Each of the inventions described has added to the comforts and joys of the world. Each of these inventions has brought about new industries in which many men and women have found employment. These stories, therefore, offer an easy approach to an understanding of the origin of certain parts of our civilization, and of the rise of important industries.The story of each invention is interwoven with that of the life of its inventor. The lives of inventors furnish materials of the highest educative value. These materials are not only interesting, but they convey their own vivid lessons on how big things are brought about, and on the traits of mind and heart which make for success.It is hoped that this book will set its readers to thinking how the conveniences of life have been obtained, and how progress has been made in the industrial world. While appealing to their interest in inventions and in men who accomplish great things, may it also bring them into contact with ideas which will grip their hearts, fire the imagination, and mold their ideals into worthier forms.

This book is the result of many years of contact with embalmers in training and in practice. We have included in this work a crystallization of essential information without which, the embalmer must be poorly equipped to carry out the many duties incident to his calling in a manner satisfactory to his patrons and to himself.Having been thrown in contact with the many problems surrounding the education of the embalmer, the authors have gained many ideas as to just how to place the information before the embalmer so that the result will be reflected in an increased capacity for good work on the part of the individual embalmer.In prescribing information for the embalmer in this manner, we know clearly just what is to be expected from the application of the sciences herein described, and wish for the novitiate and practitioner the same enthusiasm for actual knowledge that has helped us thus far in arranging the information.In Part One, we have chronicled, from the word of historians and men of the present day, a condensed, yet complete exposition of the funeral customs relating to the care of the dead, giving our readers a better understanding of present methods by reason.

Caro leitor, Com alegria e gratidão informo que o livro que você tem nas mãos é a junção dos volumes um e dois da obra "A Existência". Intencionalmente, será apresentado nas próximas páginas o segund

Déjà Vu é uma história que já existia em minha mente há muitos anos; um dia, simplesmente a transpassei para as páginas. Esta é a curta saga de Ariel, uma adolescente de dezesseis anos que fica desol

When we look at a globe, we see seven distinct landmasses. But geography holds a massive, hidden secret. Just beneath the turbulent waves of the Pacific Ocean, surrounding the islands of New Zealand and New Caledonia, lies an enormous, fully recognized eighth continent, 94 percent of which is completely submerged.Submerged Zealandia tells the thrilling scientific detective story of how geologists spent decades proving the existence of a landmass half the size of Australia. This wasnt a mythological Atlantis, but a massive chunk of continental crust that violently broke away from the supercontinent Gondwana and slowly sank beneath the sea over millions of years.The book details the extreme challenges of deep-sea bathymetry and satellite gravity mapping required to chart this invisible world. It uncovers what Zealandias fossilized drowned valleys and submerged mountain ranges tell us about the earths violent tectonic history and the ancient flora and fauna that once thrived there.Expand your understanding of the planet you live on. This geological expedition proves that the map of the world is far from finished, and that entire continents can still be hiding right beneath our feet.