Ted Talks offers thousands of talks online, both short and long, covering a huge range of topics. These talks often feature an expert in the field with a unique insight. There are also a number of useful animated videos available. Visit the website, type in a key word in the search box, and explore your interests!
If you are interested in maths check out the Tom Rocks Maths YouTube Channel. Dr Tom Crawford is a mathematician at the University of Oxford and in his videos he explores different aspects of maths in engaging ways.
The BBC has a podcast series called Law in Action with over 100 different episodes which has been running since 1984. It provides analysis of the legal stories in, behind, and ahead of the news. These are all available online on the BBC website.
Freakonomics provides a free series of online podcasts linking economics to various interesting topics.