Archaeology: Footprints From Our Past
Mysterious hollows found in Mexico reignite a debate about the first Americans.
Portfolio: Landscapes of Mars
Stunning satellite images of Mars reveal avalanches, sand dunes and more.
Reproduction: The Opposite Of Sex
Biologists uncover why some species reproduce without sex, despite its drawbacks.
Conservation: Bugging Out
Scientists take to the treetops to count the insects in a South American rainforest.
Cosmology: A Hole in the Universe
A giant cold spot in space is forcing scientists to reconsider the big bang.
Disease: How To End Malaria
Malaria kills one million people each year. Here are the five best tools for eradicating it.
Neurology: Eyes without a Face
Why are some people born without the ability to recognize faces?
Technology: Inspired by Nature
Eight cool nature-inspired inventions, from fish-like cars to blades that mimic rat teeth.
Geology: Rocks From Light
Could sunshine have driven the evolution of the continents millions of years ago?