哈尔·克莱蒙特，本名哈里·斯塔布斯，生于美国麻省，曾获哈佛天文学学士学位，二战时入伍，成为一名轰炸机飞行员。退伍后成为中学教师，长期教授科学课程。 克莱蒙特一生共创作了十五部长篇以及大量中短篇小说。1954年，《重力使命》开始在《惊奇科幻》连载，成为他的代表作，该书也是科幻史上硬科幻小说的代表。 克莱蒙特在科幻作家和读者中具有崇高的声望。他是1991年世界科幻大会的主宾，1998年入选科幻/奇幻名人殿，美国科幻奇幻作家协会于1999年星云奖颁奖仪式上授予他科幻大师称号。

For a profit -- and adventure -- Barlennan would sail thousands of miles across uncharted waters, into regions where gravity itself played strange tricks. He would dare the perils of strange tribes and stranger creatures -- even dicker with those strange aliens from beyond the skies, though the concept of another world was unknown to the inhabitants of the disk-shaped planet of...(展开全部)

For a profit -- and adventure -- Barlennan would sail thousands of miles across uncharted waters, into regions where gravity itself played strange tricks. He would dare the perils of strange tribes and stranger creatures -- even dicker with those strange aliens from beyond the skies, though the concept of another world was unknown to the inhabitants of the disk-shaped planet of...(展开全部)

For a profit -- and adventure -- Barlennan would sail thousands of miles across uncharted waters, into regions where gravity itself played strange tricks. He would dare the perils of strange tribes and stranger creatures -- even dicker with those strange aliens from beyond the skies, though the concept of another world was unknown to the inhabitants of the disk-shaped planet of...(展开全部)

哈尔·克莱蒙特，本名哈里·斯塔布斯，生于美国麻省，曾获哈佛天文学学士学位，二战时入伍，成为一名轰炸机飞行员。退伍后成为中学教师，长期教授科学课程。 克莱蒙特一生共创作了十五部长篇以及大量中短篇小说。1954年，《重力使命》开始在《惊奇科幻》连载，成为他的代表作，该书也是科幻史上硬科幻小说的代表。 克莱蒙特在科幻作家和读者中具有崇高的声望。他是1991年世界科幻大会的主宾，1998年入选科幻/奇幻名人殿，美国科幻奇幻作家协会于1999年星云奖颁奖仪式上授予他科幻大师称号。

For a profit -- and adventure -- Barlennan would sail thousands of miles across uncharted waters, into regions where gravity itself played strange tricks. He would dare the perils of strange tribes and stranger creatures -- even dicker with those strange aliens from beyond the skies, though the concept of another world was unknown to the inhabitants of the disk-shaped planet of...(展开全部)

JACK AND ANNIE are on a mission to save Merlin from his sorrows! Charged with finding the second of four secrets of happiness, the brother-and-sister team travel back in the magic tree house to the period known as the Renaissance. This time, Jack and Annie will need more than a research book and a magic wand. They'll need help from one of the greatest minds of all time. What wi...(展开全部)

In a straightforward approach, Hanania Benklifa provides readers the practical knowledge needed to trade options conservatively in Profiting with Iron Condor Options: Strategies from the Frontline for Trading in Up or Down Markets. The objectives are simple: make 2%-4% a month staying in the market as little as possible. Market experts use option condors to consistently earn mo...(展开全部)

In a straightforward approach, Hanania Benklifa provides readers the practical knowledge needed to trade options conservatively in Profiting with Iron Condor Options: Strategies from the Frontline for Trading in Up or Down Markets. The objectives are simple: make 2%-4% a month staying in the market as little as possible. Market experts use option condors to consistently earn mo...(展开全部)

Now that answering complex and compelling questions with data can make the difference in an election or a business model, data science is an attractive discipline. But how can you learn this wide-ranging, interdisciplinary field? With this book, you’ll get material from Columbia University’s "Introduction to Data Science" class in an easy-to-follow format. Each chapter-long lec...(展开全部)