Some immunocompromised people remain at risk for severe COVID-19 despite being vaccinated. Studies hint that an additional vaccine dose might help.
An ancient shark bite victim died quickly, before his body was recovered and buried, a new study finds.
A fossil analysis shows the flying reptile hatchings had a stronger bone crucial for lift-off that adults and shorter, broader wings for agility.
Images show that the coronavirus clears the respiratory tract of hairlike structures called cilia, which keep foreign objects out of the lungs.
Now about 1 kilometer south of its landing spot, the rover has spotted several promising spots in its search for hints of ancient life.