Six female scientists—historical and contemporary—who don’t have much name recognition but who have done important, interesting work.

The deserts of Namibia are dotted with odd circular bare patches, ringed by the dry desert grasses. They're called "fairy circles." It’s a desert whodunit.

Very little is known about the giant squid, which surely has added to the strange creature's mystique.

The physics behind the fun: roller coasters provide so many examples of basic principles that they are a staple of physics lessons.