A mathematician's apology (PDF). The early chapters are mostly grumbling about getting old. But then he starts talking about mathematics, with real poetry and love for the subject. Very nice.
Eudoxus. This ancient Greek anticipated Dedekind cuts and calculus. He also mapped the heavens and the earth. Yet no work of his survives--only frequent citations in the works of Euclid, Aristotle, Hipparchus, and more.
Triangle centers. Every triangle has a centroid. But oddly enough, that isn't the only center of a triangle. MathWorld has a picture showing over a thousand of them.
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