For the first time ever, astronomers have detected circularly polarized light emitted from a dying star collapsing into a black hole. Above is an artist's impression of the collapsing event, which is known as a gamma-ray burst.
Epidemiology is a key factor of public health. Public health aims to promote healthier lifestyles and improve quality of life. Epidemiology assists public health by observing and suggesting ways to control health epidemics.