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)

In the mist-shrouded haze of the past, the world of Azeroth teemed with wondrous creatures of every kind. Mysterious Elves and hardy Dwarves walked among tribes of man in relative peace and harmony -- until thearrival of the demonic army known as the Burning Legion shattered theworld's tranquility forever. Now Orcs, Dragons, Goblins, and Trolls allvie for supremacy over the sca...(展开全部)

简介：老铁们，来了噢！

作者简介： 罗伯特·欧皮斯柯（Robert L. Oprisko），美国普渡大学政治学博士，现为美国印第安纳大学全球变革研究中心（Center for the Study of Global Change）研究员，兼任学术网站E-International Relations主编和编委会主任。研究领域包括当代政治哲学、国际关系理论和批判性大学研究（critical university studies）。主要著作有Honor: A Phenomenology (Routledge, 2012) 和Michael A. Weinstein: Action, Contemplation, Vitalism (Routledge, 2014)。 译者简介： 曹亮亮，政治学博士，现为重庆医科大学马克思主义学院副教授，湖南大学马克思主义学院博士后。主要研究领域...(展开全部)

在线阅读本书 Joel's best friend Tony drowns while they are swimming in the forbidden, treacherous Vermilion River. Joel is terrified at having to tell of his disobedience and overwhelmed by his feelings of guilt.

When his best friend drowns while they are swimming in a treacherous river that they had promised never to go near, Joel is devastated and terrified at having to tell both sets of parents the terrible consequences of their disobedience. "A powerful, soul-stirring novel told simply and well."--"Booklist, " starred review. A Newbery Honor Book; ALA Notable Children's Book.

Joel dares his best friend, Tony, to a swimming race in a dangerous river. Both boys jump in, but when Joel reaches the sandbar, he finds Tony has vanished. How can he face their parents and the terrible truth?

本书的两位作者分别是美国宇航局（NASA）前顾问、哥伦比亚广播公司（CBS）科学部顾问里理查德•霍格兰德和NASA航空航天工程顾问麦克•巴拉。在本书中，他们披露了由NASA实施“阿波罗登月计划”时的“月球接收实验室数据和图片控制部”前主管肯•约翰斯顿提供的大量内部信息，向世人展示了一个被NASA蓄意隐瞒了40年的惊人事实：智能生物曾在人类之前到过月球，并留有遗迹。 理查德•霍格兰除此书外尚著有畅销书《火星上的建筑》。麦克•巴拉则著有《融合》。