What is full of holes but still holds water?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

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.

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

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?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?