Ms. Clavijo's daughter, Brenda, is the rare female rider, sporting a 1958 Schwinn with a mini license plate on the handlebars bearing her name.

WSJ: Showing Off Their Schwinns

It will be mounted on a pole, and in front of it, we'll have a memorial plate made of black stone bearing the names of 99 airmen who died for our freedom over my homeland.

BBC: Norfolk

Such concentrations are usually created by geological events, such as volcanic eruptions and tectonic plate shifts that steer hot metal-bearing fluids into upper, accessible parts of the Earth's crust, erosion, or massive sedimentary movements.

WSJ: Exhausting the Earth's Resources? Not So Fast