Le Grand Chit-Chat 02: WTF are Tannins?

You hear it all the time... tannins, tannins, tannins. But what are they? And most importantly, how do I identify them and do I even want them in my wine?!? Join us as we discuss all things tannin with Siobhán MacArdle (@periodicallydrinkingchemicals), who studies wine's molecular chemistry in her spare time at CalTech.