As smart, if not smarter, than most dogs. (And definitly smarter than most humans)
Because rats are smart and play with you
um....NO
They eat worms rats 
you can rap rats on each other but, they would probably die and a dump or/and kind of smart person would do it ;) -Thanks for you question-
Domestic rats typically live 2-3 years. Wild rats have a shorter lifespan, usually 1-2 years.
No. Rats are naturally pack animals and fret when left alone. Domestic rats are best kept in groups of two or more of the same sex.
Yes, but they can adjust to whenever you are awake too!:)
Probably because wild rats carry diseases and they steal human food. But domestic rats are nothing like wild rats. They are very intelligent and cute. Hope this helped!
Any pet that is non-domestic. The only non-domestic animal that people hates are flies & rats.
No, rats never carried plague. It was the fleas that they carried. Domesticated rats don't have fleas. Even wild rats are very clean and any fleas they do have don't carry plague much anymore.
people are very smart
I don't think so