I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

What has no start, end, or centre?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

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.

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

You have two rectangular wires.

Both of them have property that when you light the fire from one end , it will take 60 minutes to get completely burn.

However, they do not burn at consistent speed (i.e it might be possible 1st 20% burn in 50 minutes and 80% can burn in 10 minutes).

So how could you measure 45 minutes ?