The speed of dark.
OK, wise guy!
You know the speed of light.
Ho hum, yawn! Pert near 186,000 miles per second.
or...for you Europans [nearly 300,000 km/sec].
But if you're really smart!.... If you're really smart!
You'll know the the speed of dark.
So...I confess...I need to know!
What is the speed of dark?
