超市里的大多数鸡蛋看起来都千篇一律。一般是纯白色，运气好能买到棕色。但有几个品种的蛋是蓝色，可以在全食超市买到。长岛大学的进化生态学家丹尼尔汉利关心鸡蛋的颜色，有一个特殊原因。我经常研究鸡蛋，鸡蛋是我理解生态和进化过程的工具之一。

The first week of public hearings has ended in the impeachment inquiry into President Trump. Summing up the proceedings, the Chair of the House Intelligence Committee, the Democrat Adam Schiff, claimed Mr. Trump's conduct was far more serious than anything done by President Nixon during the Watergate scandal.

The key here is not the size of the rocket. The key here is frequency. If you actually wanted to democratize space and enable access to space, launch frequency is the absolute most important thing out of all of this. Now, I wanna say that, in order to really democratize space, there's three things you have to do.

美国经历了一系列辉煌的投资繁荣期，比如十九世纪六十年代的铁路，二十世纪四十年代的底特律汽车工业，本世纪疯狂的石油开采，现如今，最新一轮高回报投资时机已经成熟，但这次不是钢筋水泥，而是剧本、声音、银幕和明星。本周迪士尼依托其海量片源，推出一项流视频服务。