Prove that twice of ten is the same as twice of eleven.

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

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?

Why did the Girl throw the butter out of the window?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

I have an eye but still cannot see.

Who am I?

What is more useful when it is broken?

Can you identify the hidden rebus in the image below?