Marvin D. Perez Lopez, 22, pleaded guilty to charges including kidnapping and attempted sexual battery and was sentenced to ...

Explaining the passage of time has been a gnarly problem in physics basically forever, but physicist and computer scientist ...

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

Looking up reveals nature’s skylight, framing Arizona blue against fiery red stone in perfect composition. Photo credit: ...