Well, good evening,everyone. On behalf of Michelle andmyself, welcome to the White House. Thisis truly one of our favorite nights of the year, and not just because ofeveryone who visits the White Hous
So very serious project. When the Fukushima disaster happened, 现在我们来看一个严肃的项目。日本福岛核事故发生时， a bunch of people in Japan, they realized that the information that the government was giving wasn't really ope
So the reason there's a time difference on Mars right now, 火星上的时间和我们现在的时间是不一样的， from the time that we're at is because the Martian day is longer than the Earth day. 因为火星的一天比地球要长。 Our Earth day is 24 h
The first day of the experiment, we got out to our plot 实验的第一天，我们来到了实验地点， and a grizzly bear and her cub chased us off. 突然一头灰熊和她的熊宝宝出现，把我们赶跑了。 And I had no bear spray. But you know, this is how forest
