Why is the tractate Pesachim plural? Why are many tractates plural? • Why must we search with a candle, and does a flashlight qualify as a candle? • When must we search for chametz, twilight or night? • Why did the Rabbis require us to search for chametz before Pesach? • Black holes: A biblically revealed phenomenon • Why did the Sages call it Pesachim instead of the Biblical name, Chag HaMatzos?