Earth's core: solid or liquid? Yes — we know more about distant galaxies than our own interior.
Only twice in Earth's history have supermountains risen, and both times reshaped life forever.
Gödel found a time-travel solution in General Relativity, revealing spacetime can loop on itself.
Tracing the violence, protests and arrests stemming from federal immigration sweeps across the U.S.
Tardigrades can survive almost anything—even most of Mars. But one Martian chemical stops even them.