A. Rashi says either a womans name or it refers to an unknown person.
Q. What difference is there whether something is real Ribis or only dust of Ribis ?
A. Whether the Judges will have him pay it back.
Q. Why are the laws different when orphans are involved ?
A. Because the local Beis Din are considered as their Father to defend their rights.
Q. Why does a Torah scholar need to be more stringent ?
A. Rashi explains so that others do not learn to treat an issur lightly.
Q. What is the Mashkon of Sura ?
A. They would write on the document that at the end of the designated amount of years the field would go back without any payment.
Q. Which great Sage acted as if he were an ordinary person ?
A. Revina , see last Tosfos.
Now may be a good time for a gem of Torah study.