Existential risk -- the second big problem. 存在风险——第二个重大问题。 Existential risk is a threat to human survival, or to the long-term potential of our species. 存在风险是对人类生存，或对整个人类种群的长远潜能的一种威胁。 Now, why do I sa
And all of this matters greatly, because public safety to me is the most important function of government. 所有这些事项都很重要，因为我认为，保证公共安全是政府最重要的职能。 If we're not safe, we can't be educated, we can't be health
You know, this is crazy. We do this all the time, even on an everyday level. 你知道，这很不正常。我们总是在想这些，甚至在日常生活的状态下。 If you think about the last time you had a wobbly tooth. 如果你想想最后一次，我不知道，你有一颗松动的牙。 You know
On Friday, I traveled to Ft. Stewart in Georgia to meet with soldiers from the Third Infantry Division. These men and women have fought with bravery and honor in some of the most dangerous places on t
