What is always in front of you but can’t be seen?

Can you arrange the six given marbles in a manner that each one of them is touching all four marbles of different colours?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

What demands an answer, but asks no questions

John is the son of Jacob.
So,
Jacob is the_____of John's father?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?