What is full of holes but still holds water?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

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?

Can you find out which options fits best with the missing column?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

If 1+9+8=1, what is 2+8+9?

what does the below math rebus puzzle mean?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

Why Wine Glass Stem is so long?