You're on a warm, sunny beach with soft, golden sand.
(Sounds good so far!)
You're given a wheel barrow full of the sand.
(This is starting to sound like work!)
In it is buried one grain of red sand.
(At 50 grains of sand per inch, you now have over a billion grains in a two foot
You can dump, refill and dump the wheel barrow for the rest of eternity
(or longer if you like).
Question: Will the one grain of
red sand ever end up on the top of the pile?
Answer: Probability says
YES, because one grain MUST end up on top, so it's reasonable to assume that given enough
time, the red grain will be the one.