What is full of holes but still holds water?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Why are all black people so quick ?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

I have Rs.50 and I spend it in the way as below.

What does below rebus means ?