Identify the hidden meaning behind this picture?

I cannot talk, but I always reply when spoken to. What am I?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Solve the following series:
AZ, GT, MN, __, YB

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

It is always ahead of me yet I can never see it. What is it?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

What is red and smells like blue paint?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?