In the video of this talk I will go through the PDF handout, please be sure to download it. There will be no slides. Please note: Getting the video to start playing *inside* the OSF site might take a long time; in that case, I advise that you download the video (the button is on the right-hand side of your window) and then watch it from your computer. For this reason, if you'd like to leave comments, please click on the PDF handout and leave the comments there (and not in the video page). In the recorded video, between minutes 29-36, you will hear occasional faint screams. Please do not be alarmed - we do not torture prisoners in our cellar. It is only my son, who (quite healthily) responds to the duty of homework in another routine Corona morning. Thank you for your consideration. I will be available for the live Q&A session on zoom.us on: - April 13, 16:00-17:00 (CET), Zoom link: https://us04web.zoom.us/j/7620989154 - April 16, 16:00-17:00 (CET), Zoom link: https://us04web.zoom.us/j/7620989154 A link to the meetings will posted here 10 minutes before, at 15:50. Otherwise, you can leave your comments on this page and I will promptly respond, or you can send me an email (idanl@bgu.ac.il).