Is Nabi (sallallahu alaihi wasallam) superior to the other Ambiyaa (alaihimus salaam)?

Q: Two persons, a Muslim and a Jew, quarrelled. The Muslim said, "By Him Who gave Muhammad superiority over all the people! The Jew said, "By Him Who gave Moosa superiority over all the people!" At that the Muslim raised his hand and slapped the Jew on the face. The Jew went to the Prophet and informed him of what had happened between him and the Muslim. The Prophet sent for the Muslim and asked him about it. The Muslim informed him of the event. The Prophet said, "Do not give me superiority over Moosa, for on the Day of Resurrection all the people will fall unconscious and I will be one of them, but I will be the first to gain consciousness, and will see Moosa standing and holding the side of the Throne (of Allah). I will not know whether (Moosa) has also fallen unconscious and got up before me, or Allah has exempted him from that stroke." (Buhari 3.41.594)

Please give me a description, I thought that Nabi Muhammad (sallallahu alaihi wasallam) is more superior than Nabi Moosa (alaihis salaam)

Reciting "Ya Salaamu" for a sick person

Q: For the last couple months my grandfather has become extremely ill, me and my extended family have been taking turns in traveling to Bangladesh to visit him. My aunt is currently in Bangladesh. An imam from Bangladesh has told my aunt to recite “Ya Salamu” as a form of tasbeeh 50,000 times. Both me and my mother have not come across this tasbeeh and after looking for it we have not found it, we are both concerned that this is bidah (innovation) and that it is not authentic, please could you clear the air if this is authentic or not.

Insurance, medical aid and using banks in Western countries

Q:

1. Are all forms of insurance haraam in the west? If a person doesn’t have car insurance in a western country and they have an accident, they have to pay $10,000 to cover the costs of not only their own vehicle but the other vehicle if it is their fault? Where can a Muslim who doesn’t have insurance, get all that money from?

2. Is medical/dental insurance haraam in the west? There are Muslims in the west that live with their elderly parents and they always have to go to hospital and if they didn’t have medical insurance, they would have to pay so much thousands of dollars of money that they simply wouldn’t have it. Where would they go to get their medical treatment. Would they do nothing?

3. Many people say that when you earn money in the west and go to banks to withdraw that money, that money is interest money which the bank runs on so you can’t do anything?

Keeping non-Muslim women as slaves

Q: In Islam, it has been allowed to have intimacy with slave women and to even have children from them. Islam also prescribes the rights of slave women which are the responsibility of the master. And slave women traditionally have been the unbeliever women, who were purchased or captured during wars they waged on Muslims.

My question is that, can a wealthy Muslim man living in a non Muslim country, exercise the provision of keeping unbeliever women as slaves? Whereas unbeliever women are willing to live with him (with free will) on the same rights/conditions prescribed in Islam for slave women. What is the ruling on keeping non Muslim slave women this way?

What is mani and mazi?

Q: I wanted to know what exactly is mani and mazi. I know one is thick and one is thin but what about the excitement thing? Mani means you have to have a ghusal and mazi is just whudhu, but I'm not sure what they actually look like. Is mazi like water (just liquid) or is it a little bit thick and strechy?