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  Mayan Astronomy: The History of...

  Editors Charles River

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  Many ancient civilizations have influenced and inspired people in the 21st century, and the Greeks and Romans continue to fascinate the West today, but of all the world’s civilizations, none have intrigued people more than the Mayans, whose culture, astronomy, language, and mysterious disappearance all continue to captivate people. In the past decade especially, there has been a renewed focus on the Mayans, whose advanced calendar led many to speculate the world would end on the same date the Mayan calendar ended in 2012.  
  	For the Maya, astronomy was not a purely scientific pursuit but intimately linked to religious, mythological, and ideological elements that were of the highest importance. The celestial realm held a sacred nature, as did the many gods and goddesses that dwelt there, so for all Mesoamerican cultures, astronomy was a fundamental part of their everyday lives. Thus, astronomy was present in their calendars, religion, and even agriculture, and in close relation to astronomy, the concept of time was also an essential part of their worldview. The Maya recorded time on almost every surface they could, including lintels, cornices, panels, stelae, friezes, ceramics, and paper. This insistence on capturing dates has led many scholars to suggest the Maya were obsessed with time. 
  The Maya had some of the most advanced astronomical measurements in the world, and their work built upon thousands of years, spanning from around 2500 BCE until the the arrival of the Spanish in 1519. Thanks to their hieroglyphic writing, archaeologists have been able to learn a wealth of information about the way they lived and their complex system of beliefs.

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  "Business Ideas & Side Hustles...

  Bob Babson

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  This audiobook is narrated by an AI Voice.   
  Dreaming of starting your own business but not sure where to begin? Business Ideas for Young Entrepreneurs: Start a Business & Gain Financial Freedom is your down-to-earth guide to turning big dreams into real results. 
  Author Bob Babson speaks directly to young, ambitious readers who want to break free from the 9-to-5 and create something that’s truly theirs. Through relatable stories, friendly advice, and simple steps, Bob shows you that you don’t need to be rich, famous, or “ready” to get started—you just need the courage to take that first step. 
  Inside, you’ll discover: 
  How to find your entrepreneurial spark and keep it alive 
  The different types of businesses you can start today 
  Practical side hustles that build income and confidence 
  Lessons from real experiences—both failures and wins 
  Motivation to stay strong when things get tough 
  Whether you’re still in school, working a day job, or just curious about entrepreneurship, this book will inspire you to start small, dream big, and build a life of freedom and purpose—one bold step at a time.

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  Cosmic Rays - Understanding...

  Steff Jaywan

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  Cosmic rays are an intriguing aspect of astrophysics, originating from various sources in the universe, such as supernovae, pulsars, and even black holes. They consist of charged particles accelerated to incredible energies, often far beyond what our most powerful particle accelerators on Earth can achieve. These particles, when they collide with the Earth's atmosphere, create secondary particles in a cascade of interactions, leading to a fascinating array of phenomena. 
    
  Studying cosmic rays provides valuable insights into the universe's most extreme environments and processes. They offer clues about the composition of cosmic objects, the nature of dark matter, and the magnetic fields permeating space. Moreover, understanding cosmic rays is crucial for space exploration, as they pose radiation hazards to astronauts and spacecraft. 
    
  Researchers use ground-based detectors, high-altitude balloons, and even satellites to study cosmic rays from different vantage points. By analyzing the energy spectrum, arrival directions, and particle types, scientists aim to unlock the mysteries surrounding these enigmatic messengers from the cosmos.

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  The Plastic Bottle

  Valérie Guillaume

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  Imagine a plastic bottle is thrown into a river. The story begins as the current carries it out to sea. Where will it end up? Follow the journey of this bottle and you will experience an exciting adventure. Think about all the plastic that is being dumped in our rivers and oceans. Every year, more and more plastic ends up in the sea, and this could be very bad for future generations. Join us in taking action to reduce plastic waste and protect our oceans for the future.

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  Hands-on Cryptography with...

  Md Rasid Ali

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  Master Cryptography with Python: From History to Real-World Implementation.
  Book Description
  Cryptography is the backbone of modern digital security, and Python makes it accessible for everyone. Hands-on Cryptography with Python takes readers from foundational concepts to advanced cryptographic systems, equipping them with both theoretical understanding and practical implementation skills using Python.
  You’ll begin with setting up the platform and Installation and move on to understanding the basics of cryptography—exploring classic ciphers, their evolution, and their role in secure communication. Next, you’ll advance to Symmetric Key Cryptography and Asymmetric Key Cryptography, learning how to implement encryption algorithms step-by-step with Python.
  As you progress, you’ll dive into essential cryptographic components like Hashing and Message Integrity, enabling you to safeguard data and verify its authenticity. The book then introduces miscellaneous cryptographic schemes and highlights the principle that “Security is Only as Strong as the Weakest Link”, encouraging you to identify and address vulnerabilities.
  Toward the final stages, you’ll gain hands-on expertise in TLS Communication, the backbone of secure data exchange on the web. The journey culminates with an exploration of current trends in cryptography, including lightweight cryptography and post-quantum solutions, ensuring you stay ahead in this ever-evolving field.
  Table of Contents
  1. Platform Setup and Installation
  2. Introduction to Cryptography
  3. Symmetric Key Cryptography
  4. Asymmetric Key Cryptography
  5. Hashing
  6. Message Integrity
  7. Miscellaneous Crypto Schemes
  8. Security is Only as Strong as the Weakest Link
  9. TLS Communication
  10. Latest Trends in Cryptography      
  
  Index

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  TESLA: Inventions Researches and...

  Nikola Tesla, Thomas Commerford...

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  Madison & Adams presents to you this meticulously edited Tesla collection. The edition includes the works of this visionary scientist, his autobiography and the extensive biography dedicated to his various  areas of Tesla's research and inventions . 
  
  Biography "The Inventions, Researches and Writings of Nikola Tesla"  is a comprehensive compilation of Tesla's pioneering activities, research, and works. The ideas and inventions are conveyed in their own way, determining by their own place by intrinsic merit. But with the fact that Tesla blazed a path that electrical development would later follow for years to come, the compiler of the book endeavored to bring together all of Tesla's work up to that point in Tesla's life. Aside from indicating the range of his thought and originality of his mind, the book has historical value because it describes the scope of Tesla's early inventions. Tesla is recognized as one of the foremost electrical researchers and inventors and, at the time of publication, the book was the "bible" of every electrical engineer practicing the profession.
  This edition includes as well the writings of the scientist himself:
  My Inventions – Autobiography
  A New System of Alternate Current Motors and Transformers
  Experiments with Alternate Currents of Very High Frequency 
  Experiments with Alternate Currents of High Potential and High Frequency
  On Light and Other High Frequency Phenomena
  On Electricity
  My Submarine Destroyer
  High Frequency Oscillators for Electro-Therapeutic and Other Purposes
  Alternate Current Electrostatic Induction Apparatus
  An Electrolytic Clock
  Electric Discharge in Vacuum Tubes
  Notes on a Unipolar Dynamo
  The Age of Electricity
  The Problem of Increasing Human Energy
  Talking with Planets
  Little Aeroplane Progress
  How to Signal to Mars
  The Wonder World to Be Created by Electricity
  Nikola Tesla Sees a Wireless Vision
  The True Wireless
  On Roentgen Radiations
  An Interesting Feature of X-Ray Radiations
  Roentgen Rays or Streams
  Tesla's Wireless Light…

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