A KIND OF SPARK tells the story of 11-year-old Addie as she campaigns for a memorial in memory of the witch trials that took place in her Scottish hometown. Addie knows there's more to the story of these 'witches', just like there is more to hers. Can Addie challenge how the people in her town see her, and her autism, and make her voice heard? A story about friendship, courage ...(展开全部)

A KIND OF SPARK tells the story of 11-year-old Addie as she campaigns for a memorial in memory of the witch trials that took place in her Scottish hometown. Addie knows there's more to the story of these 'witches', just like there is more to hers. Can Addie challenge how the people in her town see her, and her autism, and make her voice heard? A story about friendship, courage ...(展开全部)

Stephen Wolfram 是Mathematica的创始人，他被广泛地认为是当今科学和技术计算中最重要的革新者。他1959年出生于伦敦，先后在伊顿公学，牛津大学和加利福尼亚理工学院学习。他15岁时发表了他的第一篇学术论文。20岁就在加利福尼亚理工学院获得了理论物理的博士学位。Wolfram早期的科研工作主要在高能物理、量子场理论和宇宙论方面，包括几个当今著名的结果。Wolfram 从1973年起开始使用计算机，并且很快成为正在形成的科学计算领域中的领导者。1979，他开始构造SMP--第一个现代计算机代数系，并于1981年开始商业化发行。 由于早期在物理和计算方面的科研工作，1981年Wolfram成为最年轻的MacArthur 奖学金获得者。 1981年后期, Wolfram 开始了一个雄心勃勃的新的科学方向：发展本质复杂性的一般理论。 Wo...(展开全部)

Two decades in the making, this long-awaited work from one of the world's most respected scientists presents a series of dramatic discoveries never before made public. Starting from a collection of simple computer experiments--illustrated in the book by striking computer graphics--Wolfram shows how their unexpected results force a whole new way of looking at the operation of ou...(展开全部)

Two decades in the making, this long-awaited work from one of the world's most respected scientists presents a series of dramatic discoveries never before made public. Starting from a collection of simple computer experiments--illustrated in the book by striking computer graphics--Wolfram shows how their unexpected results force a whole new way of looking at the operation of ou...(展开全部)

From the former prime minister of New Zealand, then the world’s youngest female head of government and just the second to give birth in office, comes a deeply personal memoir chronicling her extraordinary rise and offering inspiration to a new generation of leaders. “A clear and compelling case for compassion . . . an implicit repudiation of the strongman style of leadership th...(展开全部)

When Craig Gilner gets into Manhattan's exclusive Executive Pre-Professional High School, it's the culmination of a year of intense focus and grinding hard work. Now he has to actually attend the school with other equally high-performing students. Oops. And so the unraveling begins, with a depressed Craig spending more time smoking dope and throwing up than studying. Although m...(展开全部)

When Craig Gilner gets into Manhattan's exclusive Executive Pre-Professional High School, it's the culmination of a year of intense focus and grinding hard work. Now he has to actually attend the school with other equally high-performing students. Oops. And so the unraveling begins, with a depressed Craig spending more time smoking dope and throwing up than studying. Although m...(展开全部)

索比，站在朱布尔拍卖台上的孩子。没有人要他，除了一位老乞丐。在神秘的老乞丐的抚育下，他逐渐成长。但他没有过去，没有前途，没有自由。这时的他，是一个奴隶。 老乞丐的秘密身份被暴露以后，索比带着一份极其珍贵的口信，要逃避警察追捕，逃上飞船。这时的他，是一个逃犯。 索比成了往来星际的自由贸易船员，成为西苏号贸易家族中的一员。他拥有一切，除了自由。这是的他，是一个囚徒。 索比返回故乡，与自己的家人重聚。阴谋和背叛等待着他，但他无所畏惧。因为，这时的他已经成为一名“银河系公民”。