Episode 212. Topic: The Great Chicago Fire. Theme: Fires. A huge fire broke out in 1871 in Chicago which destroyed a large part of the city. What caused this fire? Was it a cow? 

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Episode 211. Topic: The Great Fire of London. Theme: Fires. In 1666, London experienced a massive fire. How did it start and how much of the city did it destroy? How and when did it end? Did anyone get in trouble? 

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Episode 210. Topic: Tumbleweeds. Theme: Invasive species. Tumbleweeds and their symbolism are common in America. Did you know most tumbleweeds in America are actually an invasive bush species? Where did they come from and why are they dangerous? 

Episode 209. Topic:  Kudzu. Theme: Invasive species. Kudzu is everywhere in America, growing on whatever it can. Where does Kudzu come from and why was it so successful as an invasive species? How are we fighting back? 

Episode 208. Topic: The red imported fire ant. Theme: Invasive species. The red fire ant has taken over the southern United States. Where did this ant come from and why were these ants so successful? How far has this invasive species spread? 

Episode 207. Topic: The lionfish. Theme: Invasive species. How did the lionfish get into Caribbean waters? How do they affect reef biodiversity? Can we eat them to get rid of them? 

Episode 206. Topic: Too many mussels. Theme: Invasive species. Zebra mussels have invaded waters around the world with devastating consequences. Where did these mussels come from and how can they be defeated? 

Episode 205. Topic: Is porn bad for you? Theme: Addiction. Is porn addictive? Does watching porn negatively affect someone's relationship to sex? What does lifting bans on pornographic content do to a society? 

Episode 204. Topic: Cocaine and the US war on drugs. Theme: Addiction. How has cocaine legality evolved in the US and how have drug type disparities led to unequal incarceration of African Americans? 

Episode 203. Topic: Treatments for opiate addiction. Theme: Addiction. How can someone overcome opiate addiction even with severe physical withdrawals? How do they work and how well are they adhered to?