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Grokking Bitcoin

**Summary** If you think Bitcoin is just an alternative currency for geeks, it’s time to think again. *Grokking Bitcoin* opens up this powerful distributed ledger system, exploring the technology that enables applications both for Bitcoin-based financial transactions and using the blockchain for registering physical property ownership. With this fully illustrated, easy-to-read guide, you’ll finally understand how Bitcoin works, how you can use it, and why you can trust the blockchain. Foreword by David A. Harding, Contributor to Bitcoin documentation. Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. **About the Technology** Inflation, depressed economies, debased currencies … these are just a few of the problems centralized banking has caused throughout history. Bitcoin, a digital currency created with the ambition to shift control away from change-prone governments, has the potential to bring an end to those problems once and for all. It’s time to find out how it can help you. **About the Book** *Grokking Bitcoin* explains why Bitcoin’s supporters trust it so deeply, and why you can too. This approachable book will introduce you to Bitcoin’s groundbreaking technology, which is the key to this world-changing system. This illustrated, easy-to-read guide prepares you for a new way of thinking with easy-to-follow diagrams and exercises. You’ll discover how Bitcoin mining works, how to accept Bitcoin, how to participate in the Bitcoin network, and how to set up a digital wallet. **What’s inside** * Bitcoin transactions * The blockchain * Bitcoin mining * Bitcoin wallets
**About the Reader** Intended for anyone interested in learning about Bitcoin technology. While a basic understanding of technical concepts is beneficial, no programming skills are necessary. **About the Author** **Kalle Rosenbaum** is a computer scientist, an avid Bitcoin supporter, and the founder of Propeller, a Bitcoin consultancy. **Table of Contents** 1\. Introduction to Bitcoin 2\. Cryptographic hash functions and digital signatures 3\. Addresses 4\. Wallets 5\. Transactions 6\. The blockchain 7\. Proof of work 8\. Peer-to-peer network 9\. Transactions revisited 10\. Segregated witness 11\. Bitcoin upgrades
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Grim Reunion

Aisling Grimlock has a lot going on.
Her boyfriend is keeping a secret … with her brother. She’s finally on her own collecting souls for the family reaping business. Oh, and her mother is back from the dead and may be eating people to keep herself alive.
When trouble comes knocking and someone Aisling adores is left injured in the crossfire, she’s out for blood and vengeance. Her brothers want to believe their mother is telling the truth – and part of Aisling does, too – but protecting those she loves is more important than buried memories.
Griffin vows to stand by Aisling, but he’s out of his element and worried the weight of the world may drag her down. He fears he doesn’t have the strength to stop it.
Aisling wants the truth, and she’s willing to fight to get it. Sometimes a good lie is better than a bad truth, though, and Aisling might not like what she finds at the end of memory lane.
The final fight is between good and evil, but who will end up on what side? **
### Sinossi
Aisling Grimlock has a lot going on.
Her boyfriend is keeping a secret … with her brother. She’s finally on her own collecting souls for the family reaping business. Oh, and her mother is back from the dead and may be eating people to keep herself alive.
When trouble comes knocking and someone Aisling adores is left injured in the crossfire, she’s out for blood and vengeance. Her brothers want to believe their mother is telling the truth – and part of Aisling does, too – but protecting those she loves is more important than buried memories.
Griffin vows to stand by Aisling, but he’s out of his element and worried the weight of the world may drag her down. He fears he doesn’t have the strength to stop it.
Aisling wants the truth, and she’s willing to fight to get it. Sometimes a good lie is better than a bad truth, though, and Aisling might not like what she finds at the end of memory lane.
The final fight is between good and evil, but who will end up on what side?

Grapevine Springs

Could the entire history of an Old West mining town be false?
Did Grapevine Springs ever really exist?
Duster Kendal wants to know the answer to that question. But to get the answer, he must turn for help from two top researchers who must risk everything, including their lives, to find the answer.
A gripping new adventure in the Thunder Mountain series.
*“Thunder Mountain* by Dean Wesley Smith is one of those reads that defies genre classification. Take some romance, throw in a little bit of historical fiction and add a dash of time travel and science fiction and you have the basis for this interesting story. … The premise for *Thunder Mountain* is intriguing and will appeal to fans of both historical and science fiction. This is an easy, light read, and I am interested in revisiting these characters on their future adventures.”
*—Fresh Fiction*
*“Melody Ridge* is the novel I’ve been waiting for. I *loved* it.”
—Bestselling author Kristine Kathryn Rusch

Good Night, Mr. James: And Other Stories

**Strange, poignant tales of life in outer space and on tomorrow’s Earth from the multiple Hugo Award–winning Grand Master of Science Fiction.**
Virtually every major author from science fiction’s fabled golden age—including Poul Anderson, Isaac Asimov, and Robert A. Heinlein—agreed that Clifford D. Simak was one of the greatest among them. Named Grand Master by the Science Fiction Writers of America, the award-winning author created enduring visions of future worlds, perilous space explorations, and weird alien encounters as rich in emotion and humanity as they are in ingenious invention. This is an essential collection of short fiction from the remarkable mind and heart of a true giant of twentieth-century speculative fiction, featuring powerful examples of literary science fiction at its very best.

Beginning with the unforgettable title story—a wry and chilling horror tale about cloning and alien invasion that inspired the classic teleplay “The Duplicate Man” from the television series *The Outer Limits* —Simak propels the reader on a breathtaking journey across the galaxies and into the future. He then enthralls us with the strange chronicle of twin siblings, one tied to the Earth, the other drawn to the stars; imaginings of a volatile reunion of two former enemies who must join forces on Jupiter’s moon or face extinction; and the story of a house in the middle of nowhere that serves as a gateway back to prehistoric times.

With his wondrous tales of a journalist’s miraculous discovery of fairies and sprites in the world, a census three centuries in the making that uncovers an unknown leap forward in human evolution, and the nightmare realities of future elder care, Simak demonstrates once again that he is not only one of the greatest science fiction writers of the twentieth century, but also one of the greatest of all time. **
### Sinossi
**Strange, poignant tales of life in outer space and on tomorrow’s Earth from the multiple Hugo Award–winning Grand Master of Science Fiction.**
Virtually every major author from science fiction’s fabled golden age—including Poul Anderson, Isaac Asimov, and Robert A. Heinlein—agreed that Clifford D. Simak was one of the greatest among them. Named Grand Master by the Science Fiction Writers of America, the award-winning author created enduring visions of future worlds, perilous space explorations, and weird alien encounters as rich in emotion and humanity as they are in ingenious invention. This is an essential collection of short fiction from the remarkable mind and heart of a true giant of twentieth-century speculative fiction, featuring powerful examples of literary science fiction at its very best.

Beginning with the unforgettable title story—a wry and chilling horror tale about cloning and alien invasion that inspired the classic teleplay “The Duplicate Man” from the television series *The Outer Limits* —Simak propels the reader on a breathtaking journey across the galaxies and into the future. He then enthralls us with the strange chronicle of twin siblings, one tied to the Earth, the other drawn to the stars; imaginings of a volatile reunion of two former enemies who must join forces on Jupiter’s moon or face extinction; and the story of a house in the middle of nowhere that serves as a gateway back to prehistoric times.

With his wondrous tales of a journalist’s miraculous discovery of fairies and sprites in the world, a census three centuries in the making that uncovers an unknown leap forward in human evolution, and the nightmare realities of future elder care, Simak demonstrates once again that he is not only one of the greatest science fiction writers of the twentieth century, but also one of the greatest of all time.
### L’autore
During his fifty-five-year career, CLIFFORD D. SIMAK produced some of the most iconic science fiction stories ever written. Born in 1904 on a farm in southwestern Wisconsin, Simak got a job at a small-town newspaper in 1929 and eventually became news editor of the *Minneapolis Star-Tribune,*  writing fiction in his spare time.
Simak was best known for the book  *City* ,  a reaction to the horrors of World War II, and for his novel  *Way Station.  *In 1953  *City*  was awarded the International Fantasy Award, and in following years, Simak won three Hugo Awards and a Nebula Award. In 1977 he became the third Grand Master of the Science Fiction and Fantasy Writers of America, and before his death in 1988, he was named one of three inaugural winners of the Horror Writers Association&;s Bram Stoker Award for Lifetime Achievement.
 
DAVID W. WIXON was a close friend of Clifford D. Simak&;s. As Simak&;s health declined, Wixon, already familiar with science fiction publishing, began more and more to handle such things as his friend&;s business correspondence and contract matters. Named literary executor of the estate after Simak&;s death, Wixon began a long-term project to secure the rights to all of Simak&;s stories and find a way to make them available to readers who, given the fifty-five-year span of Simak&;s writing career, might never have gotten the chance to enjoy all of his short fiction. Along the way, Wixon also read the author&;s surviving journals and rejected manuscripts, which made him uniquely able to provide Simak&;s readers with interesting and thought-provoking commentary that sheds new light on the work and thought of a great writer.

Go Set a Watchman

**#1** New York Times **Bestseller**
**�** Go Set a Watchman **is such an important book, perhaps the most important novel on race to come out of the white South in decades.”   �** New York Times****
A landmark novel by Harper Lee, set two decades after her beloved Pulitzer Prize�winning masterpiece, **To Kill a Mockingbird.**
Twenty-six-year-old Jean Louise Finch��Scout��returns home to Maycomb, Alabama from New York City to visit her aging father, Atticus. Set against the backdrop of the civil rights tensions and political turmoil that were transforming the South, Jean Louise�s homecoming turns bittersweet when she learns disturbing truths about her close-knit family, the town, and the people dearest to her. Memories from her childhood flood back, and her values and assumptions are thrown into doubt. Featuring many of the iconic characters from **To Kill a Mockingbird** , **Go Set a Watchman** perfectly captures a young woman, and a world, in painful yet necessary transition out of the illusions of the past �a journey that can only be guided by one�s own conscience.
Written in the mid-1950s, **Go Set a Watchman** imparts a fuller, richer understanding and appreciation of the late Harper Lee. Here is an unforgettable novel of wisdom, humanity, passion, humor, and effortless precision �a profoundly affecting work of art that is both wonderfully evocative of another era and relevant to our own times. It not only confirms the enduring brilliance of **To Kill a Mockingbird** , but also serves as its essential companion, adding depth, context, and new meaning to an American classic.

Getting Started With Python

**Harness the power of Python objects and data structures to implement algorithms for analyzing your data and efficiently extracting information**
#### Key Features
* Turn your designs into working software by learning the Python syntax
* Write robust code with a solid understanding of Python data structures
* Understand when to use the functional or the OOP approach

#### Book Description
This Learning Path helps you get comfortable with the world of Python. It starts with a thorough and practical introduction to Python. You’ll quickly start writing programs, building websites, and working with data by harnessing Python’s renowned data science libraries. With the power of linked lists, binary searches, and sorting algorithms, you’ll easily create complex data structures, such as graphs, stacks, and queues. After understanding cooperative inheritance, you’ll expertly raise, handle, and manipulate exceptions. You will effortlessly integrate the object-oriented and not-so-object-oriented aspects of Python, and create maintainable applications using higher level design patterns. Once you’ve covered core topics, you’ll understand the joy of unit testing and just how easy it is to create unit tests.
By the end of this Learning Path, you will have built components that are easy to understand, debug, and can be used across different applications.
This Learning Path includes content from the following Packt products:
* Learn Python Programming – Second Edition by Fabrizio Romano
* Python Data Structures and Algorithms by Benjamin Baka
* Python 3 Object-Oriented Programming by Dusty Phillips

#### What you will learn
* Use data structures and control flow to write code
* Use functions to bundle together a sequence of instructions
* Implement objects in Python by creating classes and defining methods
* Design public interfaces using abstraction, encapsulation and information hiding
* Raise, define, and manipulate exceptions using special error objects
* Create bulletproof and reliable software by writing unit tests
* Learn the common programming patterns and algorithms used in Python

#### Who this book is for
If you are relatively new to coding and want to write scripts or programs to accomplish tasks using Python, or if you are an object-oriented programmer for other languages and seeking a leg up in the world of Python, then this Learning Path is for you. Though not essential, it will help you to have basic knowledge of programming and OOP.

Getting Started With Electronics

**Fun and engaging electronics projects just for kids!**
Do you have a cunning kid who’s curious about what goes on inside computers, phones, TVs, and other electronic devices? You may just have a budding Edison on your hands—and what better way to encourage their fascination with electronics than a book filled with projects they can complete on their own? In *Getting Started with Electronics* , your child will follow simple steps to safely create cool electronics projects using basic materials that can easily be found at online retailers or hobby shops.
Just imagine your child’s delight as they use clips, switches, resistors, capacitors, and more to create circuits that control light and sound! From building a nifty LED flashlight to tuning in to a local radio station using a homemade tuner—and more—your little electronic wiz’s world is about to get a whole lot brighter!
* Features vivid designs and a short page count
* Focuses on your child experiencing a sense of accomplishment
* Projects introduce core concepts while keeping tasks simple
* Teaches electronics in a safe environment

Built for the youngest of learners from the makers of the trusted For Dummies brand, you can feel good about giving your child a book that will spark their creativity.

Fundamentals of Data Visualization

Effective visualization is the best way to communicate information from the increasingly large and complex datasets in the natural and social sciences. But with the increasing power of visualization software today, scientists, engineers, and business analysts often have to navigate a bewildering array of visualization choices and options.
This practical book takes you through many commonly encountered visualization problems, and it provides guidelines on how to turn large datasets into clear and compelling figures. What visualization type is best for the story you want to tell? How do you make informative figures that are visually pleasing? Author Claus O. Wilke teaches you the elements most critical to successful data visualization.
* Explore the basic concepts of color as a tool to highlight, distinguish, or represent a value
* Understand the importance of redundant coding to ensure you provide key information in multiple ways
* Use the book’s visualizations directory, a graphical guide to commonly used types of data visualizations
* Get extensive examples of good and bad figures
* Learn how to use figures in a document or report and how employ them effectively to tell a compelling story

Freedom from the Known

In this classic work, Krishnamurti shows how people can free themselves radically and immediately from the tyranny of the expected, no matter what their age. And, by first changing themselves, can then change the whole structure of society and their relationships. Major themes of Freedom From the Known include: Awareness, Man’s Search and the Tortured Mind. A brimming spiritual well from which readers may profitably draw. **

Free Trader Box Set: Books 1 – 3

In the spirit of Anne McCaffrey’s Dragonriders of Pern®, Martelle builds a world where humans and animals interact in an ongoing fight against the enemies of civilization. Three volumes with over 800 pages are contained in this one set!
Braden and his mindlinked Hillcat build friendships with other engineered creatures and extraordinary humans as they try to create a world of Free Trade, but many obstacles stand in their way. As they encounter intransigent humans or power-hungry mutants, they fight for what they believe is right. Follow the adventures of the Free Trader as this Box Set contains volumes 1-3 of the Free Trader Series (
).

Forrest Mims’ Science Experiments

Forrest M. Mims is a revered contributor to Make: magazine, where his popular columns about science-related topics and projects for Makers are evergreen treasures. Collected together here for the first time, these columns range from such simple projects as building an LED tracker for hand-launched night rockets to such challenging builds as transforming strings of data into unique musical compositions.
A variety of photography and imaging projects are featured, including an ultra-sensitive twilight photometer that measures the elevation of layers of dust, smoke, and smog from around 3,000 feet to the top of the stratosphere at 31 miles! Most of the projects can be done with a collection of simple electronic components, such as LEDs, transistors, resistors, and batteries. To inspire and motivate readers, the book also includes profiles of such famous Makers as President Thomas Jefferson and Microsoft co-founder Paul Allen.

Forgive and Forget

He’s hot. He’s dangerous. And he can’t remember anything.
As the owner of Apple’n Pies, Joe Applin leads a quiet, uneventful life, content to spend his days serving customers who come from all over to eat his delicious homemade pies. Along with his motley crew – Bea, Elsie, and Donnie – Joe couldn’t be happier in his little kingdom of baked goods and java.
Experience has taught Joe that love is overrated – and at times dangerous. He has no intention of repeating past mistakes. But then he meets a mysterious, handsome man with amnesia, and Joe can’t deny something sweet is in the works. He isn’t one to take risks, not with his heart and certainly not with his life, but the more time he spends with the man he knows as Tom, the closer he is to losing both.