What you cannot hold but it is yours?

There is something which you can be arrested for attempting but not for successfully completing.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

A man dies of old age on his 25 birthday. How is this possible?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Can you decipher the two rows to find the hidden word?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

How can you make number one disappear by adding something to it?

How can you leave a room with two legs and return with six legs?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?