What goes up but never comes down?

What number should come in place of the question mark below?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

You can see three almost identical images below. Can you spot the odd one out from them?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

You need to remove two matchsticks to make the below equation true. Can you do it ?

Replace the question mark with the correct number in below Picture:

A man is walking down a road with a basket of eggs. As he
is walking he meets someone who buys one-half of his eggs
plus one-half of an egg.
He walks a little further and meets another person who buys
one-half of his eggs plus one-half of an egg.
After proceeding further he meets another person who buys
one-half of his eggs plus one half an egg. At this point, he
has sold all of his eggs, and he never broke an egg.
How many eggs did the man have to start with?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?