David S Day 7

 5/6 on a very friendly day for me. 

1. NFL :), D20. Wasn’t certain but was pretty confident. 
2. Joyce :(, D32. Agatha Christie is the best selling author of all time? I’m shocked.
3. North, Baltic :), D13. I assume this will play hard. Really all it could be given these names. I didn’t know the names of the arms but was confident this had to be right. 
4. Dungeons and dragons :), D01. The very clear guess. 
5. Uranium :), D11. Don’t love this question since trace amounts of heavier elements do occur naturally. But still was clear what the answer was, especially with the planet clue. 
6. Petra :), D22. Was there in 2008 and found it to be spectacular.