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…

Zara Tindall 'shocked' by her mother Princess Anne's amnesia

Zara Tindall, Princess Royal Anne's only daughter, is taking her mother's recent health scare seriously. Princess Anne was hospitalized on…