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?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

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?

What has 13 hearts but no other organs?

A bomb exploded in a room full of married couples and no one died. How?

Decode below rebus
D
N
A
T
S , D

What seven-letter word has hundreds of letters in it?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?