The deepest and sharpest images of the Milky Way's center have been obtained, enabling astronomers to estimate the mass of the black hole at the galaxy's heart with unmatched precision.
The vaccine targets so-called senescent cells, which accumulate with age.
Here's why December's Cold Moon is the longest full moon of the year.
Copperhead snakes are common in North America, and have the distinction of biting more people in the United States than any other snake.