A man dies of old age on his 25 birthday. How is this possible?

Before Balboa discovered the Pacific Ocean, which was the largest ocean before that?

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?

How can you make number one disappear by adding something to it?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

Which part of London exists in France as well ?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?