Why do we preferably have round manhole covers and not square ones?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What is next number in the pattern below:

131 517 192 123 ?

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?

How many triangles are there on the puzzle below?

Can you start the fire using two pieces of wood?

What kind of band never plays music?

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?

On a bus, there is a 26-year-old pregnant lady.
A 30-year-old policeman.
A 52-year-old random woman.
And the 65-year-old driver.

Who is the youngest?

Count the number of triangles in the below picture?