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

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

The world's largest Thanksgiving turkey was on display at a fair. Everyone was admiring it when suddenly a woman ran up and shot the turkey and left. Everyone knew her yet nobody made any attempts to stop or report her. Why?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?