When I was 12 I built a chemistry lab in my basement and have been doing chemistry since. But I learned more about chemistry from reading this trio of books by Theodore Gray than anything ever learned in school. That’s surprising because these volumes appear to be photo books, full of pictures of metal chunks, high-speed shots of chemical reactions, and photos of everyday stuff. But woven through these unusual photographs are the best explanations of how and why chemistry works. The best looking of the three is The Elements, a hundred portraits of our universe’s true heroes; the most informative and fun for me is Reactions, which reveals why matter works. Advance onto Molecules if you like these. I read them all with wonder. — KK

This website lists the astronauts in space right now, with links to their Wikipedia entries. They’re all in the International Space Station and come from Russia, China, the United States, and the European Union. — MF

The best source I’ve found for small samples of very pure elements – such as scandium, dysprosium, holmium, terbium, yttrium, uranium – including, yes, cubes of pure tungsten ($14), is Luciteria. Very reliable, thorough, and extensive catalog of all available common and exotic elements. I’ve been amassing a full collection of these universal atoms. — KK