Riddles

It's another nice summer day and I am stuck in class. Right now, we're taking a break from our Educational Psychology class. I usually like psychology and think it's really interesting. But this class is not what I expected. I think this her first year teaching this course at Cal State. Her syllabus and assignments are unclear. She goes over the definitions that are in the book for hours on end. But today we did some riddles in groups and discussed various strategies used and how it could be applied in our teaching. Try to figure them out...

1) How far can you walk into the woods?

2) A cat has more hair on one side than the other. Which side is it?

3) What comes on the next row of numbers? This is a tough one.

1
11
21
1211
111221
312211
13112221

Answers found in comments.