The moment that Black Mirror fans have been waiting for finally arrived last night, as Netflix released the highly anticipated trailer for Season 7. From virtual reality headsets to killer video ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Astronomers using ...

When a person has black or dark-colored mucus, they may have inhaled potentially harmful pollutants. Coughing up black mucus may also be due to an underlying infection or condition. Mucus serves ...