去年 ESO 一个关于激光导引星的新闻视频，比较火星了。但里面有激光导引星原理的介绍，还是有些观看价值的。

这篇文章的作者认为，探测到外星文明的电波的几率可以计算。

Although it might not be self-evident, it is in fact entirely possible to calculate the probability of detecting alien radio signals by understanding what types of extraterrestrial radio emissions can be expected and what properties these emissions can have. Using the Drake equation as the obvious starting point, and logically identifying and enumerating constraints of interstellar radio communications can yield the probability of detecting a genuine alien radio signal.

谁能解释为啥外星文明也一定会使用电波呢？

出错，也能莞尔一笑～ 遇到出错页面经常是让人讨厌的事，不过撞见些可爱的页面，有时反而成了种乐趣。个人最喜欢的404页面，是淘宝UED团队blog的那个。 “四零四啊四零四，没找到啊没找...

Movable Type 4.0 will be the first release of Movable Type that has podcasting support built into the core application, with no need for a plugin or additional software of services. In creating the plugin known as Feed Manager, I...

In these final stages of the MT4 beta, each day we ask ourselves, "will this build be the final build for the release?" To answer that question there is no better place to turn to then the real world. Yesterday...

这个世界，真的是垃圾无所不在。我相信任何一个人的手机都有过收到各种垃圾短信的时候，我也相信，绝大多数人已经习惯到麻木。 电子邮件的SPAM也很猖獗，如果不是电子邮箱服务商不断地...

在这个视频里可以看到如何用柠檬，镀锌的钉子，以及铜币做电池；如何用四个柠檬点亮一支发光二极管；如何用两个两只柠檬驱动一个计算器。

视频的作者是 Hila Science Camp，这里有制作柠檬电池图解说明，看到早有人把它翻译成中文了。

很有意思的激发孩子们对科学的兴趣的材料吧，相关的还有一个用醋做电池的视频演示。

Hila Science Camp 网站上还有不少其它科普项目和视频资料。

Last night we silently released our second release candidate and took another significant step towards a full fledged release of Movable Type 4.0. This release contains its usual impressive number of fixes, but if you look at the change log,...