Using Only Five 5's and any mathematical operator make sum as 37

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

It belongs to you, but other people use it more than you do. What is it?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

What has one eye, but can’t see?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What has to be broken before you can use it?