No bigger than a pen, this device filters smallpox, Ebola and other viruses from the blood
Astronauts propose a nuclear-powered spaceship to tow away space rocks bound for Earth
Forget medicine. Scientists want to engineer cattle that wonâ€™t get sick in the first place
With crime-fighting software inspired by evolution, a picture is worth a thousand . . . other pictures
The most sophisticated brain implant yet brings us one giant step closer to mind-controlled machines
The nation's most toxic nuke dump hopes to melt away its cleanup woes
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