 Yeah so I've taught a couple of different classes, well quite a few different classes. I think starting when I first became a professor I got a first year chemistry class which was absolutely terrifying because you'd get thrown into classes with 300 students, about two-thirds of which were going into engineering disciplines that didn't like chemistry so they didn't really want to be there and then you had to maintain their interest over the period and there'd be two a day for about six weeks during the term. I didn't teach the whole course a top part of the course but that was quite an experience, not necessarily to be repeated I don't think. I took that class here but I took that class again. Yeah yeah every first year engineer tends to take that class and then the other class I've taught are things like specialist classes in hydro metallurgy so those are just dealing with the chemical processing minerals once again so I've taught that at the third year level, the fourth year level and the graduate student level and then the other one that's really quite interesting was a course on metallurgical economics which I'm still teaching to this day and when I first joined UBC and was working with Professor Peters it was a class he taught for many years and he said Dave if you want to make sure that you get tenure and never get fired teach this class because nobody else wants to teach it so if you start to teach it nobody will want to replace you because you'll have a job for life if you're willing to keep that class and of course that was a joke at the time but it's become an invaluable class because it teaches you all about the economic aspects of what you're doing in mineral treatment which is extremely important. Yeah so we spent a lot of time actually talking about real life we talk about all sorts of things related to use of money in real life you know mortgages and pension plans and annuities and all that sort of thing but then we apply that to the mineral side as well and make sure that those personal finance issues are transferred into you know what it means to run a company and how you make money as a company and all that sort of thing so extremely valuable. And why was it so unpopular for the profs? I think because everybody likes to teach in their technical specialty they prefer to do something like that rather than something that's more generic like that and I don't think a lot of the other profs understand it as well as Ernie did and Ernie transferred that knowledge to myself and then I thrive with it I've loved that course ever since I started to teach it.