Best short riddles

You would be in 2nd. Well, you passed the person in second place, not first.

Balance.

A dry stone.

A vicious circle.

You don’t need to pay for lightning.

Let me call you Tweet heart.

Edam.

Manhole covers are round so that they won't fall through the hole into the sewer below them. No matter how you turn the cover, you won't be able to push the cover through the hole. However, if you were to have square manhole covers, you would be able to rotate the cover such that one of the edges of the square cover is lined up with the diagonal line of the square hole, which would allow the cover to fall through, causing countless problems that the general public would rather avoid.

1, 2 & 3. 1 x 2 x 3 = 6 and 1 + 2 + 3 = 6

A street.