 So this course on limits. We trying to build up to calculus, but limits are so fascinating and so interesting and so important that it stands on its own. My name is Jean Topper and I'm the head of acute care surgery at Gretisky hospital in Cape Town and also a senior lecturing surgery at the University of Cape Town. Now who's this course for? This course is for everyone involved in life sciences. So whether you do social sciences, biology, healthcare, it doesn't matter this course is for you. And as I said in the introduction, I'm going to be very tough on this mathematics. We're going to learn how to do it properly. So let's get started.