African-Americans fought for years to enter professions that were dominated by white people, like medicine, business and law. Now, experts say some of those gains have leveled off since the recession. Guest host Celeste Headlee speaks with The New York Times' Nelson Schwartz, and lawyer Lisa Tatum, about why minorities struggle to gain ground in elite professions.
Here's a sobering thought: Wild birds — including city pigeons and ubiquitous Canada geese — carry 170 different types of bird flu. You know, all those viruses with the Hs and Ns in their names, like H1N1 and H5N1.
Only a dozen of these viruses have infected humans so far, but many of those have been deadly, and three of them have caused global flu pandemics.
Does every bird flu that leaps into people have the potential to turn into the next "big one" that spreads rapidly around the world?