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

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

Solve the following series:
AZ, GT, MN, __, YB

How many triangles are there on the puzzle below?

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

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

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?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

I travel all around the world but always stay in the corner. What am I?