If you say my name, I will no longer exist. What am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

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?

Find the smallest sentence with all the English alphabet.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Can you spot the man between the coffee bean in the picture below ?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?