This ‘NOVA’ installment explores the possible purposes of strange stone formations found in the Arabian Peninsula.

Across the Arabian Desert lie colossal, enigmatic structures, some stretching for miles, visible only from the sky. Rediscovered a century ago and once believed to be defensive or ritualistic in ...

In the Indian Ocean, the Yemeni island of Socotra is one of the most biodiverse places on Earth. More than a third of the plant species on the island don’t exist anywhere else on the planet. That ...