Cal is not the readin' type. Living way high up in the Appalachian Mountains, he'd rather help Pap plow or go out after wandering sheep than try some book learning. Nope. Cal does not want to sit stoney-still reading some chicken scratch. But that Book Woman keeps coming just the same. She comes in the rain. She comes in the snow. She comes right up the side of the mountain, an...(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)

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)