This page allows you to perform various kinds of "runs" to determine if you are able to retroactively influence the output of a hardware random number generator based on radioactive decay. Your browser must support HTML5 in order to run this experiment. If you're using an older browser which supports Java™ applets, try the Java page for this experiment.
If the pendulum appears, but does not swing smoothly from side
to side (for example, it stops and starts apparently at random,
or the speed with which it's swinging abruptly changes), other tasks
running on your computer may be using resources needed to do
smooth animation. If the irregular motion bothers you, try
closing other applications and see if the motion then becomes