Light does not always travel at the speed of light. Research has found that the slowest recorded light moving was at the speed of 38 mph. The light can travel even slower if it is made to pass through obstacles such as water.
100 Mind-Blowing Slowest Facts
The thumbnail grows the slowest, the middle nail the fastest, nearly 4 times faster than toenails. Fingernails grow about 3.5 millimeters per month while toenails grow 1.6 mm on average.