it's a big loss. >> 40 years old. it's unthinkable. during what's your story we usually go back to the panel and just find out some stories that people have been interested in by the way, sal kahn earlier used polynomials. i'm not sure what it is. we've been wondering what they are every since. here's a quick video of sal kahn explaining polynomial. >> it might sound like a really fancy word. really all it is is an expression that has a bunch of variable or constant terms in them that are raised to none zero encomponents that. also probably sounds complicated so let me show you an example. if i were to give you x squared plus 1 this is a polynomial. this is binary because it has two terms. >> we're done. jeff what's your story? >> i'd like to talk about my favorite twitter feed. michael besloss does a twitter feed that is nothing but old