"Bacterium Thermus aquaticus thrives at a slightly warmer temperature, ironically, than is comfortable for people: 158 degrees F. But because it can survive at such high temperatures, enzymes from this thermophile have been studied extensively. A now-common technique for replicating and amplifying sequences of DNA known as Polymerase Chain Reaction, or PCR, was perfected when a certain enzyme was isolated from Thermus aquaticus in the 1980s. This enzyme allowed scientists to perform PCR much faster and more efficiently than before. Kary Mullis, the scientist who first discovered this, was awarded the Nobel Prize, and the enzyme itself was named "Molecule of the Year" by Science magazine in 1989."Youtube Growing up in North Korea, Hyeonseo Lee believed her life — witnessing public executions, studying the history of Kim Il-Sung with vigor — was totally normal.

Lee had no idea that people were suffering, until one day when she walked past a train station.

From TED:

I saw something terrible that I can't erase from my memory. A lifeless woman was lying on the ground, while an emaciated child in her arms just stared helplessly at his mother's face. But nobody helped them, because they were so focused on taking care of themselves and their families.

At the age of 14, she was able to escape and became a refugee in China. But her life there was not easy. She had no family, and at one point, she was picked up