 Click on the coin to flip it. Select one of the "auto" choices
from the list on the top right to make the coin flip repeatedly at
different speeds.
 As the number of times the coin is flipped increases, the graph
shows the percentage of heads out of all flips. Initially it may
be some distance of from the midpoint at 1/2, but as the number of
flips gets larger and larger, the tendency is always for the graph
to approach the line. When the graph runs off the righthand side of
the screen, the graph will recale itself automatically to show a larger
range.
 Click the "bias" to make the coin biased in favor of either heads
or tails.
 Click the reset button in the top left corner to set the count back to zero.
