Stories by Joseph Castro

The arsenic was within the mummy's hair, showing that Chileans dating back to 1,000 to 1,500 years ago likely drank arsenic-contaminated water

An isotopes analysis was used to determine that many pieces of turquoise found in New Mexico's Chaco Canyon came from as far away as Nevada

Public opinion on climate change is likely to remain divided as long as politicians send mixed messages on the issue