Can anyone tell me a word in the English dictionary which has a silent 'z'?

What breaks yet never falls, and what falls yet never breaks?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

In the four images below, can you find the odd one out?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

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?

Can you identify if it's a murder or a suicide ?