Misc: Which country has been called "the gift of the nile"?

Questions

in order for a deck of cards to be mixed up enough to play with properly, at least how many times should it be shuffled?

in physics and engineering, the property of a body that causes it to return to its original position or motion as a result of the action of the so-called restoring forces, or torques, once the body has been disturbed from a condition of equilibrium?

in physics, process of reduction of matter into a denser form, as in the liquefaction of vapor or steam?

in poker, what are five cards of the same suit?

in pottery, what is crackle?