What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

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?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

When can we add 2 to 11 and get 1 as the correct answer?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

What does this rebus means ?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

A sundial has the fewest moving parts of any timepiece. Which has the most?

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