Riddle #189

Question: A jungle is 4 miles wide. A blind boy wants to see how far he can walk into the jungle.

How far could he possibly go into the jungle?

Question: What do you call a sad bird?

Question: What kinds of balls do dragons play soccer with?

Question: What can be broken but never forgotten?

Question: What tastes better than it smells?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?