The real reason so many of us go to work when we're sick
November 2, 2016, 12:36 p.m. by Starre Vartan
About 50 million Americans don't have paid sick leave, but the issue of working while ill goes way beyond statistics.
Extinct smallpox virus could be resurrected by global warming
August 22, 2016, 1:11 a.m. by Bryan Nelson
Melting permafrost threatens to exhume a smallpox graveyard in Siberia, and it could be a sign of what's to come.
Scientists have created an entirely new form of life in the lab
August 19, 2016, 7:15 p.m. by Bryan Nelson
The new microbe has a different genetic code from all other life and will be immune to every virus on Earth.