Scientists just confirmed a 30-foot void first detected inside the monument years ago. Here’s the technology that helped scientists find it—and what it may have been used for.

Researchers surveyed the DNA of more than 200 cats spanning the last 9,000 years, including ancient Romanian cat remains, Egyptian cat mummies, and modern African wildcat specimens.

The blue lotus flower has been used as a traditional medicine in ancient Egypt for thousands of years. Today, it’s commonly consumed as a tea, smoked or vaped, or inhaled as an essential oil.