Middot - Character Traits

A Yeshiva student tricked the guy that he is sick with a Contagoues sickness so that he could learn quietly.

a yeshiva student made fun of his rabbi. His rabbi gave him permission. is that permissible?

Although it is a very big mitzvah to lend money, some people are reluctant to do so because they know of loans that proved difficult to collect. Must you lend someone money if you are not sure it will ever be repaid? What do you do if you lent money to someone who seemed very honest and sincere, but now that it comes time to repay, he informs you that he is penniless? What may you do and what may you not do to collect your money? How can you guarantee that you get your money back?

Can one use ma’aser money to pay for their grandchildren’s education? Is there a distinction between grandsons and granddaughters or Judaic studies and general studies? If it is permitted, may I putting money in a 529 fund (which earmarks savings for education, primarily post-secondary in return for tax breaks for the donor in the US)?

How did Brigadier General (retired) Effi Eitam react when he was confronted by a grizzly bear, and what can you learn from it?

According to what I have found there is no source for Gezel Sheina even in Shas. Is there an actual source?