As some of us may have a little more time on our hands, it would be a good opportunity to review the halachos of Stam. I can across some online shiurim in Hebrew on www.kolhalashon.com. הרב ברוך כחלון Rav Kachlon is the co-author of the 2nd volume of Yalkut Kisrei Haosios. הרב שלמה וינטרויב Rav Weintraub is a mo"tz and rav in Modiin Ilit. I'm told he was close to Rav S.Z. Ulman zt"l.