Scientists have found smallpox viruses in the remains of people in Chile from around 500 years ago, revealing how the virus may have evolved into a global killer.
The oldest known evidence of the plague, which sparked deadly outbreaks dating back about 5,500 years ago is more than 200 years earlier than previously thought.
Gene editing offers many transformative medical benefits. However, uncertainties concerning safety, ethical snares, and risks of inequality and unintended societal impacts demand caution.
A new study found that a pachyderm skeleton, dismissed for decades as unimportant, offers evidence of careful planning, teamwork and a calculated kill.