Why data in optical fibre is 32% slower than light
Data in fibre is often said to move at the speed of light. In standard fibre it moves at 204,107 km/s, 68.1% of it, because the glass slows the pulse.
John Mitchell
John Mitchell is a quantum physicist with a PhD in physics. He writes about the strangest facts in the universe on one conviction: they are not mysteries, they are measurements, and every one has a story about how somebody worked it out.
Moon Illusion: The Horizon Moon Is Farther and Smaller
The moon illusion makes a rising Moon look enormous. Measured, that Moon is about 1.66% farther away than the one overhead, and smaller.