What is always in front of you but can’t be seen?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

A father's child, a mother's child, yet no one's son.

Who am I?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

How many bananas can you eat if your stomach is empty?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?