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

How can a man go eight days without sleep?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

Which country gets ill every time?

I have teeth but i don't bite. Who Am I ?

Do You See It?

What number comes next in the series?

5 15 5 18 5 24 14 20 _