Which number should replace the question mark?

Look at the picture and find out which square is not linked with any of the other squares.

What demands an answer, but asks no questions

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Mr. Buttons was all set to go to the village of Buttonland to meet his friend. So, he packed his bags and left for the village at 5 in the morning. Upon travelling on a road for miles, he came across a point where the road diverged into two. He was confused on which road to take. He gazed around and he saw two owls sitting on a branch. He thought he could ask for directions for the village from the two owls. So he went to the tree. There he saw a sign which read, "One owl always lies, and one is always truthful. They both fly away if you ask them more than 1 question."
Mr. Buttons was caught in the dilemma of what to ask? And from which owl to ask, since he only had one question. What should Mr. Buttons ask?

What seven-letter word has hundreds of letters in it?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

By what process could you make a 'Tea-Table' into food?