What is the Surname of Barbie Doll?

Can you spot the man between the coffee bean in the picture below ?

Replace the question mark with the correct number in the below-given picture?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Imagine you are in a room with no windows or doors. How will you get out?

You need to arrange three 7 and mathematical symbols to form number 1?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Can you replace the question mark with the correct number?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.