Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What kind of tree can you carry in your hand?

Who is that with a neck and no head, two arms and no hands? What is it?

If six children and two dogs were under an umbrella, how come none of them got wet?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?