There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I travel all around the world but always stay in the corner. What am I?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What has one letter and starts with an E?

You see me once in June, twice in November, and not at all in May. What am I?