This video explains Manhattanhenge, the moment when the setting sun aligns with New York City’s street grid, and why it happens only on specific days each year. Breezy Johnson's winding road leads to ...

This video explains the science behind twilight, showing how Earth’s atmosphere scatters sunlight after sunset and before sunrise, creating the soft light we see in the sky. Get a sneak peek at ...

Local law enforcement, including these policemen walking past Piazza Duomo in Milan, handle most security functions at the Winter Games. A division of ICE is expected to aid Italian authorities' ...