1)
By Aharon -
Why was Aharon instructed to perform the plague of lice, and not Moshe?
2)
No warning -
Why didn't Hashem warn Pharaoh before bringing the plagues of lice, boils and darkness?
3)
And Bnei Yisrael? -
Did the lice affect the Land of Goshen, where the Bnei Yisrael lived?
4)
The lesson -
What is the significance of the fact that the first three plagues began by striking the water and the ground (see Shemos 7:20, 8:2, 8:12)? What lesson was this set of three plagues supposed to teach Pharaoh?
5)
The magicians concede defeat -
Why were the magicians unable to produce lice?