John opens the show by posing the following questions: shouldn’t everyone who is a citizen of this planet be able to move wherever they wish? What gives nations the right to control who can cross their borders? Ken is puzzled by John’s idea of planetary citizenship - people are citizens of nations, and nations have the right to control who crosses their borders. But John is not convinced, and wonders where and why nations acquired this right. Ken insists that without this right of nations, chaos would ensue, as mass immigration would occur, threatening the security and economic stability of various countries. Furthermore, Ken wonders why, if he works in this country, pays his taxes here, and obeys the laws, an arbitrary non-citizen should have the same rights as him. John insists that everyone who is born on Earth has the right to the planet’s bounty, and that there are individuals who may not be citizens of a country but contribute just as much and therefore deserve to have equal protection under the law. Ken concludes by recognizing that determining the rights and liberties of individuals by the arbitrary borders of nations is a complicated matter.

Ken and John are joined by Sarah Song, Professor of Law and Political Science at UC Berkeley and author of author ofJustice, Gender, and the Politics of Multiculturalism.约翰首先问萨拉，她对国家和边界相关话题的兴趣是否源于她的个人经历，因为萨拉的家人在她六岁的时候从韩国移民到美国。她说确实如此，并解释了她对出生在一个特定的地方或其他地方、富裕或贫穷的家庭的随意性的兴趣，以及这些因素在多大程度上决定了我们的生活前景。萨拉同意，国家是通过战争、种族清洗和其他主导大国的行为形成的。她说，国家和边界是通过武力和忧虑形成的。但是，这并没有减少国界的重要性，因为国界可以提供基本物资，包括安全和集体自治的机会。

Ken asks Sarah to comment on John’s view that the people of one nation should not have the right to control movement of other people into their country, to which Sarah says she believes John is moving too fast. We should instead ask the question of who has the right to control borders, and Sarah says she believes citizens should. John provides the example of individuals living in South Texas, bordering Mexico, as an example of an archaic, unnatural border. Still, Ken insists that a nation is more than a chunk of land, that it is more defined by people cooperating in that land, that there is an attachment or loyalty to nations that cannot merely be described by physical borders.

当Ken和John邀请观众参与时，他们讨论了划定边界时要考虑的安全问题、讨论争议国家的标准、划定边界时的经济考虑等问题。The show concludes with John at a crossroads between the two views.

• Roving Philosophical Reporter(寻找时间到5:31):哲学讲座中国伊朗亚洲杯比赛直播的记者凯特琳·埃施采访了塞尔吉奥·加西亚，他很小的时候就从墨西哥搬到了美国。加西亚讲述了他的个人故事，并探讨了美国无证移民的挣扎。
  
• 60-Second Philosopher(Seek to 49:15): Ian Shoales explores the necessity of establishing borders, looking at renowned examples of boundaries such as the Mason-Dixon line and the Oregon boundary dispute of 1844.