A Look Into the History of Light
![](https://media.wnyc.org/i/800/0/c/85/photologue/photos/137237013.jpg)
Ellen Johnson Sirleaf delivers on January 16, 2012 her inagural address in Monrovia after being sworn in as president for a second term.
( AFP/Getty Images / Getty )
( AFP/Getty Images / Getty )
Produced by Ben Gottlieb