What is full of holes but still holds water?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

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?

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.

Why are televisions attracted to people?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Look at the picture and find out which square is not linked with any of the other squares.

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

What time is it when an elephant sits on a fence?

How many words can a pen with half refill write?