Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What does this rebus puzzle means ?

What month of the year has 28 days?

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?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?