What is more useful when it is broken?

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?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Who can jump higher than a Mountain?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

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

The more of this there is, the less you see. What is it?

What can you hold in your right hand, but never in your left hand?

Can you Find and name the hidden bird in the picture below ?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?