Shiur given on a bus in Italy. The laws of the three weeks are discussed. What is prohibited on tisha b'av and why? There are three levels of aveilus- the three weeks, the nine days, and tisha b'av. Reciting shehechianu during this time period. Is it permitted to buy clothing during the three weeks? Bathing during the nine days. Not eating meat during the nine days-when and whom started this minhag, and does it apply to minors? What should be served for a seudas havraah? What is prohibited on the tenth of av?