Men such as Lenin, Stalin, Mussolini, Hitler and Mao could one day reappear, but in a different form. Their shared traits serve as warning signs for us today.
Technology gives us access to the universe while at the same time creating risks to our continued existence. Does humankind’s best hope for long-term survival come down to leaving Earth behind?
The chief engineer for NASA’s robotic Mars Exploration Program talks about what it would take to put people on the Red Planet. Will Mars be humanity’s lifeboat?
From the futility of politics to climate change to artificial intelligence, here's a look back at our most-read articles from 2018.
That sports, conventionally seen as promoting health, should be deemed a cause of death raises serious ethical questions.