Thanks @Lurchy - fixed the typo in the link
Fixed the slides download link - thanks @Lurchy
Sorry - these haven't made it up for some reason. Checking ...
Sorry - fixed link.
@Sandeep Sachan: Videos are being procesed and uploaded even as we speak. They take a little while to get up, but we'll be releasing them progressively.
It's an analogy . Of course, maybe he didn't have the capacity to catch enough rain, or it was contaminated some how, or whatever ...