What occurs twice in a week, once in a year but never in a day?

What is the centre of gravity?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Solve the puzzle by telling what does below picture means.

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Decode this picture on T-Shirt and tell what it says ?

Count the number of triangles in the below picture?

Count the number of balls in picture below: