Maybe this is embarrassing to admit, but I have to anyway: for ages, I thought different colors of gold just came from different sources ““ like some gold ore was yellow, some was white; it was the magic of nature. It somehow didn’t occur to me that gold (an element!) wouldn’t be just like a gemstone (not an element! Actually a combination of elements!) and therefore, it could only be one color. It wasn’t until recently that I learned that all the pretty gold colors are the result of thousands of years of humans messing around with alloys. Read More Gold, Gold, Gold!