HARRISBURG, Pa. (WHTM) — Truth be told, most of us probably never thought much about slide charts and wheel charts, much less what it would take to be certified the world’s top collector of ...

For example, a slide chart circa 1970 from Miss Clairol shows the proper formula for hair color. "Somebody did all the math, did all the pre-calculations, printed it on this, and now I have those ...