David Pogue sets out on a worldwide quest to find the key molecules and chemical reactions that have paved the way for human civilization, life, and even the universe as we know it. Stream all three episodes of NOVA l PBS' “Beyond the Elements” now on the PBS Video app. | PBS

19K views · 199 reactions | Unveil the greatest discovery in Egypt’s Khufu pyramid in more than 1,000 years. Scanning the Pyramids from Secrets of the Dead is streaming on the PBS Video app for a limited time: to.pbs.org/3rzGInc | PBS | Facebook