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A clip from the BBC Fun to Imagine series in which Richard Feynman is asked how magnets work and explains why 'why' questions depend on a shared framework of understanding and cannot always be answered in layman's terms.

A short clip from a Richard Feynman interview in which he explains fire, describing how burning wood releases sunlight stored by the tree, which built itself mostly from air. It showcases his curiosity and plain-spoken explanations.

Patrick Stewart on the BBC's Parkinson talk show talks humorously about going bald, how it affected his career and relationships, and how he came to accept it.

An excerpt from the 1983 BBC series Fun to Imagine in which Richard Feynman describes how he and a mathematician friend counted in their heads in different ways, one verbally and one visually. It shows that people can reach the same goal through quite different mental methods.

A 2007 Computer History Museum conversation in which Nvidia CEO Jen-Hsun Huang interviews TSMC founder Morris Chang. Chang recounts his career and the creation of the dedicated silicon foundry model.

A 2006 television appearance in which Peter Schiff warns on Kudlow & Co about the housing bubble and an approaching US economic collapse.

A 1993 interview in which Steve Jobs talks about designer Paul Rand, who created the NeXT logo. He recounts Rand's insistence on presenting a single design and his uncompromising professionalism.

A five-minute clip in which Erich Fromm asks whether the purpose of work is just making money. He argues that white-collar workers end up selling their personality, relating to others the way goods relate to each other on a market, and he points to creative pleasure, participation and usefulness to society as what work could offer instead.

A four-minute extract from the documentary The Fog of War in which Robert McNamara discusses the Gulf of Tonkin incident. He acknowledges that the second reported attack did not happen.