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

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?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

Which is faster, Heat or Cold ? Explain.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)