What has no start, end, or centre?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Can you decode the below cypher?

896983327332676578

What number replaces the question mark

Can you write down eight eights so that they add up to one thousand?

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

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

What Does this text mean:

important=important

All of you like to eat me. I am a five-lettered word. Remove the first two and I turn into an infamous animal. Remove just the first and I become a heinous crime. Remove the first and the last and you can groove on me.

Can you guess who am I?