What does this rebus means ?

PROG WORKRESS

What is so fragile that saying its name breaks it?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Can you decipher the below rebus?

PBLUESAISNUERSES

Which is heavier: a ton of bricks or a ton of feathers?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

What part of Turkey has the most feathers?

Can you solve the rebus below?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?