I have teeth but i don't bite. Who Am I ?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

When it's bad luck to meet a black cat?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

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

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?