acknowledgments

"Velcro" is a trade mark of Velcro Industries Ltd.

Thanks goes to Alberto Bobbera, Antonia Felipe, Gadiel Lucano, Christian Buehue, Vivok Kumar, and Jeremy Bezanger for their great photography. (They took all the pictures of the people and the "bitcoin") See their great work on Unsplash.com.

Thanks goes to the Illuminating Engineering Society for advancing lighting science. The "IES" symbol is circa 1906, a time which most Americans were still using oil lamps.