如何维持一段长久的友情？

In this TED series, endlessly curious data journalist Mona Chalabi investigates the research behind tricky questions — with the help of creative data visualizations. Do I have enough friends? How accurate is weather reporting? Should it take me this long to get over my ex? And there's a podcast too! To dive deeper into these topics and more, follow Am I Normal? with Mona Chalabi wherever you get your podcasts.