Factors that break wudhu

Q: Does laughing aloud in the prayer break ones wudhu?

Q:

1. I had a scratch on my knee which I thought was almost healed. However, at the end of the day, I noticed many small spots (which I assume was discharge from the wound) on my pants and kurta around the knee area. I do not know when this occurred, but it is likely that some of the discharge occurred while performing sajdah. Do I have to repeat all salaah/tilaawat for that day?
2. If one covers a wound with a bandage, and blood may or may not flow onto the bandage, would it be permissible to perform salaah in that condition, or does one have to be certain that the bleeding has stopped?
3. Referring to (2), can one lead the salaah in that condition?

Q: A shafi follower makes wudhu according to Shafi'ee fiqh and then mistakenly touches his wife without any piece of cloth in between, and this person knows that according to the Hanafi maslak his wudhu did not break and goes and prays fardh salah according to Shafi'ee fiqh without renewing the ablution (to make his life easy). Will his Salaah be valid as he is basically a Shafi'ee. Note that he does not do this all times it occurs very rarely?

Q: After shaving my private area there are very small cuts like little pricks. When I dab them with a tissue sometimes a little dot of blood appears and sometimes not. After making ghusl I apply oil to my body including private area I cannot be certain if it is bleeding after ghusl or not and if I have smeared the blood or not. Does it matter if it is smeared or not,the cut is like a prick of a pin and only a small dot of blood appears sometimes when I dab it.

Q: I was doing wudu, I stopped because I felt the need to break wind, so I did that and sometimes when standing, it can feel like it is between the thighs, so I squatted briefly to expel trapped wind. Started doing wudu again and somewhere in it, I felt a bubble, not sure what it was though and I don't think it came out of me, I think it was from my thighs and I don't think I heard or smelt anything, just had the feeling of a bubble escaping from my thighs. I just ignored it and prayed. I had doubts about it but it was maghrib so I convinced myself I was in wudu and prayed, but now I don't know.

Q: If a very small amount of blood or pus comes out (and was removed) from a wound or cut, will wudhu break?

Q: In wudhu if I touch my husband wudhu breaks? While performing umrah if I hold my husbands hand will my wudhu break? Please tell me.

Q: If someone started bleeding at zuhr time and had not prayed zuhr until 10 to 15 mins before asr and then they prayed zuhr. Then at start of asr they are still bleeding so they make wudu and pray asr. Now if they stop bleeding at asr time, will they have to repeat their zuhr or not? I heard there is a difference of opinion.

Q:

1. Someone told me that if only a drop of urine comes out you still have your wudu because a drop is less than a penny (coin), is this true?
2. All impurity which is less than 3 to 5 centimetres in diameter is excused. I am sure two drops of urine on your clothes will not make a circle which is more than 3 centimetres, is that true?

Q: When I hug and sleep with my wife sometimes a small discharge comes out (its not mani, just some fluid). Is ghusul mandatory on me to pray namaz / quran? Please explain me what needs to be done?