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 this exciting new Merlin Mission, Jack and Annie go back in time to New York City, during one of the darkest periods in the city's history--the Great Depression. Even worse, the city is in the grip of a terrible snowstorm. To stop the blizzard, Jack and Annie must save the unicorn made famous in the Cloister's medieval tapestries. But will that be enough to help a city that ...(展开全部)

Jack and Annie travel back in time to a desert in the Middle East at the behest of Merlin who has given them a rhyme to help on their mission. There they meet a Bedouin tribe and learn about the way that they live. From camel rides and oases to ancient writings and dangerous sandstorms, here’s another Magic Tree House filled with all the mystery, history, magic, and old-fashion...(展开全部)

从新手爸爸到经验老爸，只有爸爸会问的问题，只有爸爸会做的事情。所有迹象都表明你终于变成了你的父亲！ 爸爸的基本训练必须包括哪些内容？发誓作为父亲永远不会做的事情，为什么最终还是做了？爸爸和孩子一起度假时总会发生什么？哪些爸爸应该获得奖章，为什么？本书汇集了父母生涯中最具挑战性、最累、最搞笑、却又最令人兴奋的情况。

"A vibrant telling, amplified by striking images and photographs, of the Curiosity mission to Mars....A totally gratifying account." --Kirkus Reviews "Kaufman’s vivid description of the Curiosity rover mission to Mars, its history and its scientific results brings you as close as possible (without being a member of the science team) to the excitement, the frustration and the ex...(展开全部)

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》。

从新手爸爸到经验老爸，只有爸爸会问的问题，只有爸爸会做的事情。所有迹象都表明你终于变成了你的父亲！ 爸爸的基本训练必须包括哪些内容？发誓作为父亲永远不会做的事情，为什么最终还是做了？爸爸和孩子一起度假时总会发生什么？哪些爸爸应该获得奖章，为什么？本书汇集了父母生涯中最具挑战性、最累、最搞笑、却又最令人兴奋的情况。

Derek Parfit (1942–2017) is the most famous philosopher most people have never heard of. Widely regarded as one of the greatest moral thinkers of the past hundred years, Parfit was anything but a public intellectual. Yet his ideas have shaped the way philosophers think about things that affect us all: equality, altruism, what we owe to future generations, and even what it means...(展开全部)