Some love the spotlight, others keep a low profile. Here is a primer on Donald Trump's family tree: his parents, four siblings, five children, and the nieces, nephews, daughters-in-law ...

Just as a genealogical tree can reveal fascinating information, a mathematical family tree can illuminate the evolution of the discipline and the roles of the key contributors to its development.

Next, check out our interview with Survivor 48 contestant Justin Pioppi.