CowboyNeal from the still-haven't-found-what-i'm-looking-for dept.
mresolver writes "University of Chicago students have once again emerged from the library after a long winter to participate in the world's largest scavenger hunt. The multiple day event is famous for the working breeder reactor that students managed to build during the 1999 hunt. This year, the official list (PDF) includes a superconductor, working wood refrigerator, hot air balloon made to Montgolfier specifications, one-way funhouse mirror, and a walk-in Kaleidoscope."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"