Shiur from Rabbi Elimelech Kohn Ztl on פרשת עקב.  Discussed:  Why is the Mitzvah only to Bless Hashem after eating? It would seem more logical (as the Gemara writes) to make a Bracha before eating. Two Peshatim why the Torah considers the מן to be a "test" for the Bnei Yisrael in the desert.  R' Shamshon Refael Hirsch examines the similar roots of the words לחם (bread) and מלחמה (war), and writes that Bentching with a Zimun promotes Achdus and prevents conflict and war.