Someone asked a few days ago, that what is my favorite chemical reaction.
So here is it. When we place a piece of copper wire to a silver (nitrate/sulfate) solution beautiful silver crystals will start to grow on the surface of the copper, while the copper dissolves into the solution.
I have made this experiment for nearly a month, but it was worth, adorable silver crystals formed!
If anyone want to try out this experiment, here is how to do it: http://www.instructables.com/id/How-to-make-some-crystalline-metallic-silver-easil-1/