Mystery of the Missing Star
The spectacular supernova of 1987 left a hole astronomers have tried to plug for nine years.
The Best Ways to Sell Sex
Evolutionary biologists are always struggling to discover what evolution has long ago figured out--such as why, or if, ladies like a massive sperm-depositing organ, and gentlemen prefer paired fat deposits on the female form.
A Cold, Hard Look at Dinosaurs
They're neither as boring or as exciting as they've sometimes been painted.
A Clock More Perfect Than Time
In a lab in Boulder, one physicist is building a clock that will not gain or lose a second for 300 million years. Next door, a colleague is putting together one accurate for 30 billion years. And when they've finished those, they'll start working on better ones.
The Face of an Ancestral Child
The remains of an 11-year-old who lived and died 800,000 years ago have been found in northern Spain, at a place called Atapuerca. The child's people may have been the ancestors of Neanderthals. But the child's face was ours.
