NEW RIDDLES

What is that which is less tired the longer it runs?

Why are mortgages like burglars?

Why is the letter F like death?

What number is that, which, added separately to 100 and 164, shall make them perfect squares?

I'm in the book, but not on any leaf;
I'm in the mouth, but not in lip or teeth;
I'm in the atmosphere, but never in the air;
I wait on every one, but never on a pair;
I am with you wherever you may go;
And every thing you do I'm sure to know;
Though when you did it I should not be there,
Yet when 'twas done, you'd find me in the chair.

What am I?

Why is the letter F like an incendiary?

What is that which has many leaves, but no stem?

Why are two heads better than one?

A man but an animal, a horn with two hands. What am I?

As I went across the bridge, I met a man with a load of wood which was neither straight nor crooked. What kind of wood was it?