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Six years ago, on an early morning in September, Molly Birnbaum was out for her regular jog when she was hit by a car. Her pelvis was shattered, her skull fractured, her knee torn. Yet for her, the most serious damage was far less visible: she lost her sense of smell

Ask someone where they are from and most likely they will tell you their hometown, perhaps even a specific neighborhood. Put the same question to physicist Brian Cox and you get an entirely different response--one that involves the recycling of atoms brought together from the far reaches of the universe. Cox likes to remind people that every atom of their body used to be part of something else, and will become part of something new in the end.

New advances in steel nanoparticles may lead to cars that are lighter (and thus faster and more fuel efficient) than those made with conventional materials, but just as safe in a crash.

Bear-size beavers, mammoths, horses, camels and saber-toothed cats used to roam North America, but by 11,000 years ago most such large mammals had died off. To this day, experts debate what caused this late Pleistocene extinction: climate change, overhunting by humans, disease--or something else? Eric Scott, curator of paleontology at the San Bernardino County Museum in Redlands, Calif., suggests it was something else: namely, the immigration of bison from Eurasia