The below link is to a pdf version of the illustrated 54 page booklet I wrote, A Brief Introduction to Ancient Counting Systems for Non-Mathematicians.  It is an introduction and beginner's guide to ancient counting systems, including Inuit (Eskimo), Greek, Hebrew, Babylonian, Chinese, Mayan, Egyptian, Armenian, Asian rods, the quipu and abacus.  This primer is intended for the non … Continue reading A Brief Introduction to Ancient Counting Systems for the Non-Mathematician

This is my infrared camera that I use in authentication. It's a normal over-the-counter Fuji digital camera, except it had the inside infrared blocking filter removed. As with x-ray machines, infrared cameras allow you to see through layers of paint on a painting. It shows a different layer of paint than an x-ray machine.  It … Continue reading The Infrared Camera and Art Authentication