In the Channel 4 programme Breaking the Science Barrier (1996), Richard Dawkins faces down a pendulum:
This is a classic example of a “put your money (or nose) where your mouth is” physics demonstration. It also appears in Carl Sagan’s novel Contact (1985), for example, and Feynman did it during the freshman physics lectures he gave at Caltech.
Later in the same show, Dawkins interviews Douglas Adams, and gives a few comparisons to help understand the depths of evolutionary time:
(Props to Sean Carroll.)