I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

There are five people. One of them shot and killed one of the other five.
We know following clues:
1. Dan ran in the NY City Marathon yesterday with one of the innocent men.
2. Mike consider being a farmer before he moved to the city.
3. Jeff is a top notch computer consultant and wants to install Ben new computer next week.
4. The murderer had his leg amputated last month.
5. Ben met Jack for the first time six months ago.
6. Jack has been in seclusion since the crime.
7. Dan used to drink heavily.
8. Ben and Jeff built their last computers together.
9. The murderer is Jack's brother. They grew up together in Seattle.

Consider yourself to be a famous detective "Sherlock Homles", Can you find the killer?

What came first, the chicken or the egg?

Can you find the key in the picture below?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Find the value of "a" by solving the maths equation in the picture below:

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?