How many sides does a circle have?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

A father's child, a mother's child, yet no one's son.

Who am I?

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

Why did Navjot Singh Sidhu put the new January calendar in the freezer

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

You need to move three matchsticks to form three squares. Can you do it?

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

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