More than two thousand years ago, somewhere in the ancient Mediterranean world, a craftsman assembled a machine so sophisticated that modern scientists are still...

For most of human history, people have looked up and seen the same familiar scene: a blue sky, white clouds, and a bright yellow...

By Ronald Kapper   As fears of World War III grow louder in global headlines, an old and deeply unsettling question is returning to public discussion:...

For more than 4,500 years, the Great Pyramid of Giza has stood in the Egyptian desert as one of the most impressive structures ever...

For years, astronomers believed they had a clear checklist for finding alien life. Look for a rocky planet. Make sure it sits in the...

The Alien Virus That Could Turn Earth Into a Dead Planet   Space exploration has always carried a quiet fear. Every time a spacecraft travels to another...