The Earth's inner core spins more slowly. No one knows why.

Geophysicist John Vidale noticed something surprising while tracking how seismic waves move from the Earth's crust through its core. The…

A small fern with a big secret enters the Guinness Book of Records

Tmesipteris oblancolata is an obscure species of fork fern found in New Caledonia, a French territory in the South Pacific.…