请回答「Knock Knock 世界」NO. 2508017

Core Viewpoint - The article discusses various societal and philosophical questions, reflecting on historical and contemporary issues, while also promoting the podcast "Knock Knock World" as a platform for exploring these topics with a younger audience [4][10]. Group 1: War and Society - The article raises questions about the reasons behind wars and their impact on civilians, highlighting a shift in how wars are reported in modern media compared to the past [6]. - It emphasizes the need for deeper understanding of the consequences of war and the importance of discussing these issues in a more engaging manner [6]. Group 2: Urban Development and Infrastructure - The article contrasts the urban development of cities like Shanghai and Beijing, questioning the criteria for selecting a capital city and the advantages of each [7]. - It also addresses the issue of food waste in hotels and potential solutions, such as offering leftover food at reduced prices to minimize waste [7]. Group 3: Cultural and Historical Perspectives - The article reflects on the preservation of historical architecture in different regions, questioning why some areas maintain their traditional buildings while others do not [8]. - It discusses the significance of intellectual properties (IPs) like Hello Kitty, exploring their history and cultural impact [8]. Group 4: Health and Food Safety - The article raises concerns about food additives and their health implications, particularly in the context of food allergies and labeling practices in different countries [8]. - It highlights the differences in food safety awareness between Western countries and China, suggesting a need for better education on food allergies [8]. Group 5: Environmental Awareness - The article touches on the importance of protecting the environment and addressing climate change, hinting at future discussions on global warming and human impact on nature [9]. - It poses speculative questions about the future of biodiversity in the event of human extinction, encouraging curiosity about ecological resilience [9]. Group 6: Podcast Promotion - The article promotes the "Knock Knock World" podcast, which aims to engage young audiences in discussions about global events and diverse perspectives [10][12]. - It provides details about the podcast's release schedule and subscription pricing, encouraging listeners to explore its content [10][13].