If you were ever in any doubt about the dedication of university professors, then this man will put all your uncertainties to bed.
Despite roads being washed out, sinkholes forming and residents being trapped as strong El Niño storms swept San Diego, this hardy teacher refused to be beaten by the weather.
The visiting professor at University of California, San Diego, ploughed on with his vector calculus lecture - even as water flooded into the classroom.
"His actions are a testament to the dedication of UCSD's faculty," wrote student Tony Murillo, who captured video of the scene. "P.S. He did end up letting us out early."