Tried your best but still couldn't figure it out. Never fear, the answers are here:
 
A SICKNESS UNTO TRUTH
 
1. A statement that works is "I am a healthy knave." Neither a healthy knight nor a sick knave would say that, since it would be untrue. Nor could a healthy knave say it, since in his case it would be true. Only a sick knight could say it.
 
2. "I am not a healthy knight" is a valid statement. A healthy knight wouldn't make a false statement, and if he was sick he couldn't tell the truth. Nor could a healthy knave make such a statement, since it would be untrue. Only a sick knave could.
 
3. This is a bit more difficult: to say that an inhabitant is either sick or a knight (and possibly both) is tantamount to saying that he is not a healthy knave. So the problem can be restated: What statement could be made by any inhabitant except a healthy knave? Well, one that works is "I am not a sick knight." A sick knight could falsely say that, while both a sick knave and a healthy knight could truthfully say it as well. But a healthy knave, who can only lie, could not make that true statement.
 
4. The solution is so simple that it is apt to be overlooked. To say that the native is either sick or a knight but not both is to say nothin more nor less than that he is either a sick knave or a heathy knight--in other words, that he tells the truth! "Two plus two equals four" would do the trick.
 
5. Aaron's statements are either both true or both false. If they are both true, then Bowaine is a sick knight, which implies that Bowaine is lying. On the other hand, if Aaron's statements are both false, Bowaine is a healthy knave, in which case Bowaine is again lyin. Thus whatever Aaron may be, Bowaine's statements about Aaron are false. It thus follows from Bowaine's lies that Aaron must be a sick knight, and thus a liar himself. Aaron's false statements in turn show that Bowaine is a healthy knave. (Disover Magazine, February 1995)
 
MENTAL ARITHMETIC
 
1. 18
2. 32
3. 36
4. 45
 
TRIVIA
 
1. Prometheus  
2. Sir Richard Grenville  
3. Greece    
4. Desdemona
5. Mozart
6. London and Paris  
7. Around the World in 80 Days  
8. Lot
9. Hamlet
10. In a beautiful pea-green boat
11. twelve
12. Ian Fleming
13. Grimm Brothers
14. Friar Tuck
15. Stag
1