X-ray scans and digital reconstructions revealed the contents of undelivered letters that were sealed more than 600 years ago.
Mount Etna, Europe's most active volcano, has been erupting for nearly two weeks straight, and the photos are stunning.
This dramatic breakup comes after a major crack formed on the shelf in November 2020 and continued to grow.
A new form of active matter known as swirlonic matter clumps together in quasi-particles that bend the laws of physics.
Alligators often 'snorkel' during cold snaps, so they don't become trapped underwater without access to air.