汗是哪来的呢？ 流汗是怎么回事？人为什么要流汗？ 这是一本让孩子认识自己身体的科学图画书 故事从孩子的视角来发问和作答 讲知识点讲得浅显、有趣 画家通过稚拙的笔触描绘出各种流汗细节 将知识点表现得幽默而生动 成功营造了轻松、愉悦的阅读氛围

黑洞是现代天文学最诱人的发现。它是如此奇特，已经成为许多神话和幻想作品的主题。它果真是无情地吞食光和星球的怪物吗？它究竟只是由相对论理论所作出的一种猜想，还是可观测的实体？为着回答这此问题，作者将带领我们作一次穿越时间和空间的奇妙旅行。他将解说恒星是如何诞生、发光和死亡，将把我们带进超新星、X射线星和类量体的神奇世界。我们将到达宇宙的边缘，到达当代物理的最前沿。

The world-famous cosmologist and #1 bestselling author of A Brief History of Time leaves us with his final thoughts on the biggest questions facing humankind. Stephen Hawking was the most renowned scientist since Einstein, known both for his groundbreaking work in physics and cosmology and for his mischievous sense of humor. He educated millions of readers about the origins of the universe and the nature of black holes, and inspired millions more by defying a terrifying early prognosis of ALS, which originally gave him only two years to live. In later life he could communicate only by using a few facial muscles, but he continued to advance his field and serve as a revered voice on social and humanitarian issues. Hawking not only unraveled some of the universe’s greatest mysteries but also believed science plays a critical role in fixing problems here on Earth. Now, as we face immense challenges on our planet—including climate change, the threat of nuclear war, and the development of artificial intelligence—he turns his attention to the most urgent issues facing us. Will humanity survive? Should we colonize space? Does God exist? These are just a few of the questions Hawking addresses in this wide-ranging, passionately argued final book from one of the greatest minds in history. Featuring a foreword by Eddie Redmayne, who won an Oscar playing Stephen Hawking, an introduction by Nobel Laureate Kip Thorne, and an afterword from Hawking’s daughter, Lucy, Brief Answers to the Big Questions is a brilliant last message to the world.

这是一个关于创造和想象的故事—— 很久以前，奥托伯伯发明了世上第一台发动机。 于是，有了校车、出租车、警车、飞机、坦克…… 可万一石油枯竭了，那该怎么办？ 派勒能找到方法解决吗？

英国著名物理学家史蒂芬•霍金近日发出警告，称外星生物可能真的存在，但是人类与他们接触可能会带来毁灭性的后果。在“探索”频道新近推出的纪录片《与霍金一起了解宇宙》中，霍金指出外星生物在消耗尽自己星球上的资源后便会乘坐大型飞船到他们能够到达的星球掠夺资源，并将那里开拓成为他们的殖民地；如果有外星生物到访地球，那将会像当年意大利航海家哥伦布登陆美洲大陆一样，最后给人类带来毁灭性的灾难。 68岁的霍金在片中谈论了他对宇宙外星生命问题的最新思考。他认为外星生命几乎肯定存在於宇宙的许多其他地方——不仅是活在行星之上，甚至还可能存在於恒星中心，甚或是漂浮於行星间的广阔宇宙。 霍金认为外星人存在的理论依据，超乎寻常的「简单」。他指出，宇宙有1000亿个银河系，每个都包含上亿计恒星，在这样一个庞大空间裏，地球不大可能是唯一演化出生命的行星。「我觉得，纯粹出於数学脑筋去想，单是如此巨大的数字，就足已令『外星人存在』的想法显得完全合理。真正的挑战是，去发现外星人到底是什么样子。」 《与霍金一起了解宇宙》这纪录片耗3年多制作，期间霍金曾多次坚持对剧本作大幅修改。Discovery执行制作人史密森（John Smithson）说：「他希望能制作一个既能娱乐大众、又能娱乐科学界的节目，考虑到其复杂性，这是一项很难的工作。」(简介转自Dexter)

Determined to understand the repeating patterns he was finding in nature, French mathematician Benoit Mandelbrot used an early form of computer imagery to produce his own versions, coining the recurring shapes fractals. This installment of the PBS series "Nova" examines the rules of these self-similar patterns and explores the ways these fascinating geometric configurations can be applied in the fields of science, medicine and the arts.