Extinct Pathogens Ushered The Fall of Ancient Civilizations, Scientists Say

While scientists have assessed the status of more than 147,000 plant & animals, there are thousands of species considered too "data deficient" for a full assessment. As a result, those species haven't been included in the listing of threatened or endangered species, updated each year by IUCN.

Scientists Find a Key Brain Difference Between Primates and Other Animals

Tikal: The iconic ancient Maya city in Guatemala