Which is heavier: a ton of bricks or a ton of feathers?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

what does this picture(rebus) riddle means ?

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?

What can go up a chimney down, but can’t go down a chimney up?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

The Little ant seems to be always confused. Do you know why?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?