Immigrant visa Rarely deniable?

We really don't have a magic answer to that. Usually every case is decided on its merits. Good luck.

Green card by grandparent

There is no basis for a grandparent to file I-130 for a grandchild. Try talking to an immigration lawyer to help you out if there are other...

Holding two different USA visas in two different passports

I absent of fraud or misrepresentation I am not sure how that can even be possible.

Can I sue a University for messing up my phd applications and preventing me from having an interview for my dream project?

You should contact a litigation attorney in your area to discuss your options after reviewing your facts. Good luck

Will I get stopped at the airport if I am trying to leave to my home country. I have overstayed in the US for 5 years.

You shouldn't have a problem leaving the US, but you will have a problem if you try to obtain a visa to enter the US in the future. Good luck

Do they ask me at the border about my original copy of my dentistry licence or just copy is enough for my TN VISA ?

You better have all the documents you might need. Talk to your lawyer to help prepare you. Good luck.

Your credit score or history shouldn't impact your naturalization application, however if you are in default on taxes or other financial...

Field investigation can be an indication of suspicious activity or of concern to the government. Prepare very well for your interview as it will be...

Public defenders are employed by the county/state to defend indigent defendants.

Can I apply for u.s citizenship I'm already in u.s for tow years and i have been contributed in military more than sex years?

Try to do some homework about the requirements to become a US citizen, you can start here if you...