Mercury
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Also available in hardcover

The winner of a copy of Mercury is … Marc Sobel! In answer to the question of what his favorite metal was, he said:

I’m going with Einsteinium. Not only does it have the best namesake, but its atomic number is 99, it is the rarest of all metals (none exists in nature) and also the most deadly.

Isn’t that fascinating? I learned so much about metals and laughed at clever jokes — readers here are so creative and know so many interesting things! Thanks to everyone for participating and for reading the site.