Of course, Turnbull’s statement is not a historical proposition at all, but a claim about the mood best suited to the times we live in. “We have to be optimists,” Turnbull told David Koch on Sunrise ...

For decades, the Kármán Line, set at an altitude of 100 kilometers (or 62 miles) above sea level, has been the widely ...

Centuries after his death, Christopher Columbus continues to stir fascination and fierce debate. His historic Atlantic ...