We have the treatments to end health problems like infant diarrhea. Sendhil Mullainathan says the "last mile" nudge is to encourage people to use them.
It's called "Running (Refugee Song)." Keyon Harrold, the trumpet star and one of the composers, talks about the art of creating a song with a conscience.
In the U.S., VapoRub goes on a sick child's chest. In Russia, it might go on the soles of the feet. Cultural norms have a big effect on how we diagnose and treat illnesses, especially at home.