People at a Denver party early this month celebrate the recognition of an amendment to the Colorado constitution legalizing recreational use of marijuana.
Credit Brennan Linsley / AP
Parents drill certain warnings into their children: don't drink, don't smoke and don't do drugs. But those conversations have gotten tougher now that two states, Colorado and Washington, have decriminalized some recreational marijuana use.
A whoonga smoker near Durban, South Africa, shows a crushed AIDS pill in the palm of his hand before mixing the drug with marijuana.
Credit John Robinson / AP
Opportunists who market street drugs may be undermining the global struggle against AIDS.
In South Africa, two mainstay HIV drugs have found their way into recreational use. That may help explain why some HIV patients are resistant to these front-line medicines even if they've never been in treatment before.
On Tuesday, the National Institutes of Health in Maryland is holding a second day of talks about whether and how to continue funding some controversial scientific experiments.
Back in January, virologists agreed to temporarily stop research that was creating new forms of bird flu because critics argued that the work was too dangerous. NIH officials are now seeking input from scientists and the public about how to proceed.