Nazi Germany had no hope of making an atomic bomb, uranium cubes reveal

How many articles have been written about this subject? Many! According to Google Search "the subject comprises thousands of academic papers, books, and historical studies published over the last eight decades."

How close did Hitler ever come to developing an atomic bomb? What was actually known as fact at the time?

Did not some German scientists actually delay or sabotage the effort/project? I don't remember the details anymore.

What was the effect e.g. the exodus of Jewish scientists?

Nazi Germany had no hope of making an atomic bomb, uranium cubes reveal | Science | AAAS "Experimental reactor needed much more uranium and heavy water than the country could muster"