I make two people out of one. What am I?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Before Mount Everest was discovered, what was the highest mountain in the world?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

What do you get if you add 2 to 100 four times?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?