Phosphorus Book

"Shut up an' eat yer goddamn banana!" is a common refrain in my house. This is because of potassium, which is found in hearty quantities in that disturbing, yellow fruit. Like all alkali metals, it's reactive as hell, making it one of the floozies or "easy-pieces" of the periodic table, throwing itself willy-nilly into the laps of other elements, shedding electrons like a two-bit whore staring at a checkbook.
For us, potassium is very good for your liver and for strewing shit over fields. For the universe, writ large, it makes nice fireworks and lethal injections. Potassium: killer nymphomaniac element = the best element?
On a side note, this series is awesome. Compare reading one of these books in these series about elements (written for middle-schoolers) to the corresponding "Wikkiepedio" page. The latter is incomprehensible, full of blue words that lead to more incomprehensible pages. Books: your friends and mine.