Sums of Harmonic-Type Series,
James Lesko
Almost Alternating Harmonic Series
Curtis Feist and Ramin Naimi
The Brachistochrone Problem
Nils P. Johnson
The Truth about Königsberg
Brian Hopkins and Robin J. Wilson
Simmons' Sublimal Channel
Héctor Rosario
A Property Possessed by Every Differentiable Function
Jingcheng TongA Tale of Two Tickets
Marc BrodieThe Chain Rule for Matrix Exponential Functions
Jay A. WoodExtending Theon's Ladder to Any Square Root
Shaun Giberson and Thomas J. Osler