What should be done with a calculator taken from the university laboratory?

Q: Many years ago, I took a calculator from one of the labs in my university. The calculator was kept in the cupboard presumably because someone lost it or forgot it. Now several years have passed, and I have no idea who the owner of the calculator is/was. What can I do in this situation? Shall I give money on behalf of the owner in charity?

Using marijuana

Q: I would like to know what the ruling behind use of marijuana is. Someone in my family believes it is halal and does it for stress relief and
general pleasure. One of his friends continues to provide it to him and I do not have any control on how to stop this. Please help me.

Royal Jelly

Q: Royal Jelly, Bee Propolis, Bee Pollen.

السلام عليكم. لا أدري كيف الترجمة الصحيحة لهذه الأشياء...و سؤالي: هل يجوز للمسلم أن يشرب (أو يأكل) هذه الأشياء لزيادة القوة و الصحة؟

Going for Hajj without a mahram

Q: A woman went on hajj without being accompanied by a mahram. She had sons, but all of them were too busy with their lives to follow her so she went in a large, safe group of women. I know this is impermissible, but what is the ruling regarding the actual hajj - was her fard of hajj fulfilled? Or was it invalid, making it fard for her to repeat the hajj?