Memorial Day, which will be celebrated on May 31, 2021, is one of the most important American holidays. Observed annually on the last Monday of May, it honors the brave men and ...

A  collection of 1,000  prehistoric structures dubbed mustatils — the plural form of the Arabic term for rectangles —  scattered across 124,274 miles (200,000 kilometers) in nor...

Geologists have long maintained that our Earth comprises four layers  — the crust, the mantle, the outer core, and the deepest layer — the inner core.  However, a team of scient...