The screaming mummy’s facial expression has been a mystery for more than 90 years (Picture: Sahar N. Saleem/S Samia El-Merghani/Frontiers in Medicine/Cover Media)

'Governments and militaries may fully depend on these systems, making it possible to seize hard power.'

Visits Optimize Integration Group's Overseas Global headquarters: A New Silk Road Story of a Top 500 Chinese Enterprise

'There are no words that can ease the anguish.'

She and 11 others were sentenced to execution by hanging.

The discovery is nearly identical to another hexagonal structure at its North Pole.