U.S. astronauts who return to the moon’s surface in the years ahead for the first time in more than half a century will have ...

In 1848, James Marshall was building a lumber mill in northern California for his employer, John Sutter. One January morning, Marshall spotted sparkling pebbles within the mill's outflow; Sutter and ...

Are people on the South Pole walking upside down from the rest of the world? – Ralph P., U.S. When I was standing at the South Pole, I felt the same way I feel anywhere on Earth because my feet were ...