Outros livros que poderiam interessá-lo

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  Quantum Gravity

  Introbooks Team

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  Modern science and physics in particular, primarily consists of two basic theories, namely the general relativity or particle physics and the theory of gravity. There had been great heights scaled by these two theories taken together in the past, since the very beginning. Hence, it’s highly surprising to accept the fact that the overall picture given by these two theories taken together reflects a higher degree of inconsistency. This inconsistency arises mainly after taking into consideration a part of the theory, the standard model, as a quantum theory while the other, gravity, as a classical theory. At a first glance, it may appear that quantizing general relativity may remove the inconsistencies. If one performs an expansion in terms of Feynman diagrams, the technique used in the standard model, then one finds infinities that cannot be absorbed in a renormalization of the Cosmological constant also known as Newton constant. 
  In fact as one goes to higher and higher orders in perturbation theory one would have to include more and more counter terms. In other words, the theory is not renormalizable. Hence, the most crucial principle in constructing the so called Standard model is not capable to hold firm. What is more surprising to an observer is the fact that an inconsistent theory could fit in so well with the experiments, apparently explaining it flawlessly. What happens is that quantum gravity effects are usually very small due to the weakness of gravity relative to other forces. The effects of gravity are proportional to the energy or mass, so they see a rise in high energies.

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  History of England from the...

  Thomas Babington Macaulay

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  This chapter traces the history of the Glorious Revolution in Scotland, including the reaction of the country's religious parties, the installment of William and Mary, and the campaigns of the Highland Army.  (Summary by Leon Mire)

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  The Book of Flaco - The World’s...

  David Gessner

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  The story of Flaco, the Eurasian eagle-owl who escaped from Central Park Zoo and captured the hearts and imaginations of millions of followers around the world. 
   
   
   
  Nature writer David Gessner chronicles the year-long odyssey of Flaco and the human drama that followed the owl who captured the imaginations of New Yorkers and people around the world. Though he'd spent his life in a cage, Flaco learned to survive in New York City by eating rats, squirrels, and birds. He was an immigrant coming from elsewhere to make it in the big city. Central Park, the island of green in an urban sea, was his new home territory. 
   
   
   
  Flaco's urban adventure brought controversy, pitting those who felt he should be returned to the safety of the zoo against those who created the "Free Flaco" movement. The birding world was fractured over the ethics of the online sharing of his location that brought scores of enthusiasts to view him each day. And his end—with a grim necropsy revealing Flaco had suffered a viral infection from eating pigeons and had multiple rodenticides in his system—serves as a Rachel Carson-esque warning about the harm we've done to our urban environments, inspiring the passage of long-sought legislation protecting urban birds and regulations meant to reduce the use of rodenticides in New York City.

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  A Country of Two Agricultures

  Wandile Sihlobo

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  Nearly three decades after the dawn of democracy, South Africa has remained a country of 'two agricultures'. On the one hand we have a subsistence, primarily non-commercial, black farming segment. On the other hand, however, we have a predominantly commercial and white farming sector that is well-resourced and has access to domestic and international trade networks.
  These disparities can be traced back to South Africa's painful history where, for decades, black farmers were on the margins of government support and also experienced land dispossession and livestock plunder.
  A Country of Two Agricultures focuses less on history and more on the present and the future, explaining why these disparities have persisted in the democratic era, and what it will take to overcome them. It aims to contribute to a better understanding of the variety of agricultural forces, taking into account both questions of domestic political economy and external factors, as well as to bring to light new risks and opportunities.
  Wandile Sihlobo offers insights into the role of agriculture in the South African economy from an agricultural economy perspective, and provides political economy insights that are rooted in the experiences of farming communities on the ground and right through the value chain.
  Beyond insights on the realities this book offers the government, the private sector, and anyone interested in the betterment of the South African economy, tools to grapple with this duality, and proposes a framework for bolstering the black farming segment for growth and competitiveness – and ultimately food security.
  Wandile Sihlobo is the Chief Economist of the Agricultural Business Chamber of South Africa (Agbiz) and the author of Finding Common Ground: Land, Equity and Agriculture.

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  Trailblazers - Women in Science

  Scientific American

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  Sally Ride, the first American woman to go to space, once said that she didn’t set out to be a role model, but after her first flight, she realized that she was one. Like her, the twelve women scientists in this collection became unintentional heroes through perseverance and hard work, making great discoveries in all areas of science. From Vera Rubin’s examination of the internal dynamics of galaxies to Nobel Prize winner May-Britt Moser’s study of the brain’s GPS-like navigation system, Trailblazers highlights the achievements of women who became role models for us all.

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  Dinosaurs Unleashed: The Untold...

  Elias Thornfield

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  Dinosaurs Unleashed: The Untold Journey of an Ancient World 
  ⭐⭐ Simplified Audio Guide ⭐⭐ 
  Are you looking to unravel the mysteries of the ancient world and solidify your understanding of dinosaurs? 
  Seeking a comprehensive guide that provides all the necessary insights to discover dinosaur secrets in "Dinosaurs Unleashed"? 
  Your search ends here! 
  This guide serves as your definitive companion for deepening your knowledge, applying your curiosity, and engaging in hands-on exploration. With this, you're geared for a thrilling journey. 
  Updated for the latest discoveries and research in paleontology. 
  Key features of this enriched guide: 
  - Profound insights about the world of dinosaurs 
  - Detailed explanations of different dinosaur species 
  - Fruitful strategies for learning and exploring 
  Our guide distinguishes itself through comprehensive coverage, which is essential for your paleontological adventure. Concepts aren't merely skimmed; they are delved into with precision. 
  Please note that this guide is not affiliated with any official paleontological entity and is purely an independent resource for your benefit. 
  Designed with a clear structure and easy-to-understand language, our dinosaur guide ensures smooth transitions between topics. Say goodbye to dense jargon and welcome clear, precise, and engaging content. 
  So, why wait? Click the BUY NOW button, secure your guide, and begin your journey to discovering dinosaur secrets with "Dinosaurs Unleashed"!

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