Tahaarat

Toilet leakage problem

Q: There was leakage in the washroom ceiling and then it stopped by itself. There is a washroom on the top floor. The water from the leakage has dried now. If somebody uses the washroom and wet feet touch floor and they walk around the house will the house be impure. The floor was not washed after the leakage water dried. Is whole house impure and I can't pray there?

Dissecting dead bodies

Q: In medical school you have to take anatomy class and dissect cadavers (dead bodies) for educational purposes of course. The cadavers are non-Muslim as far as I know but you wear gloves and lab coat while dissecting.

1) Do you have to do ghusal every time you have that class because you dissected the cadaver or is wudhu sufficient to do wudhu to pray namaz?

2) If you have more classes after that and you just wash your hands do you have to read anything while washing them?

Wet dream

Q: If I am not sure if I had a wet dream while I was a wake and had my period, am I impure? And if I go to sleep and use my blanket and sit in my house are those places napaak?