On demons, angels, human beings, and animals. Also, on how people should not attempt to look in the prohibited 4 directions, or aspects of the functioning of the heavens, the future, etc. Rather, we focus on this world. Plus, not looking at a rainbow, whether for reasons that disparage the phenomenon or for those that elevate it. Also, the question of one who is overcome by a desire to sin - what should he do? When should he dress in black and go find a place where he can sin? Also, the mishnah and semichat yadayim - the laying on of hands. Plus, [Who's Who] The Zugot (from Pirkei Avot). But what are the details here? Machloket! Specifically, on whether semikhah was required when. Essentially, the first recorded dispute. Plus, [Who's Who: Yehudah Ben Tabbai... and Shimon ben Shetach.