点击科学

2017-04-28

疫苗是我們对抗众多传染性疾病的最佳防御手段，通过接种疫苗挽救了数百万生命，并使人们免受痛苦的折磨。但是现如今，在许多发展中国家，一些父母由于受到关于风险的持续性不实信息的影响，在决定是否要给自己的孩子接种疫苗的时候犹豫不决。本期中的特别章节针对接种疫苗有可能产生的真实的、罕见的风险进行了评估，并涉及了如何克服毫无根据的恐惧等内容。

Vaccines are our best defenses against many infectious diseases， having saved millions of lives and prevented immeasurable suffering. Yet today， in many developed countries，these defenses are fraying as parents， swayed by persistent untruths about the risks， hesitate to vaccinate their children. This special package sizes up the actual， rare risks of vaccines and what is known about how to overcome groundless fears.

2017-05-05

封面上展示的是一张游戏牌——也就是我们在扑克游戏中使用的纸牌，在牌面上以艺术再现的方式展现了一个数字电路板。对于这种玩家在游戏中拥有非对称信息的游戏，例如扑克，已经被证实对人工智能具有挑战性。DeepStack人工智能系统采用一种新的方式，将局部搜索技术引入到游戏中。从而使DeepStack成为了在一对一无限注“德州扑克”中击败了职业扑克玩家的计算机程序。

A playing card—as used in the game of poker— with an artistic rendition of a digital circuit board. Games in which players have asymmetric information during play， such as poker， have proven challenging for artificial intelligence. The computer program DeepStack takes a new approach， bringing local search techniques to such games. DeepStack defeated professional players at heads-up no-limit Texas hold'em poker.

2017-05-12

封面上展示的是位于马达加斯加西部穆隆达瓦附近的猴面包树（全称格朗迪迪埃猴面包树）林中的日落景象。通过高分辨率卫星测绘显示，类似于这样的旱地森林，其潜在的蒸发蒸腾量远远超过降水量，林地覆盖范围比以前的记录高出40%。

Sunset at the Avenue of the Baobabs （Grandidier's baobab trees Adansonia grandidieri Baill.） near Morondava， western Madagascar. Highr—esolution satellite mapping reveals that the extent of forest cover in drylands such as this， where potential evapotranspiration substantially exceeds precipitation，is globally more than 40% higher than previously reported.

2017-05-19

许多科学家在多个国家学习和工作着，这就是一个人类迁徙冲动驱使下的极端例子。通过开放研究者与贡献者身份识别码（ORCID）的数据重构，封面图中描绘了个体科学家在其职业生涯中所经历的历程；蓝色路径代表Rimantas Kodzius的轨迹，他可能是在世的迁徙次数最多的科学家。见本期有关于人口迁徙的特別章节。

In an extreme example of humans' migratory urge，many scientists study and work in multiple countries. The cover depicts the journeys of individual scientists over the course of their careers， as reconstructed from data in ORCID； the blue path represents the trajectory of Rimantas Kodzius， who may be the most migratory living scientist. See special section on human migration.endprint