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

Investigate the threat posed by violent far-right groups that have ties to anti-government, white supremacist ideologies and criminality. American Insurrection from FRONTLINE | PBS is now streaming on the PBS Video app. | PBS

FRONTLINE investigates the consequences of America’s withdrawal from Afghanistan. With exclusive access to a militant wing of the Taliban, correspondent Najibullah Quraishi tells the story of Iran’s growing influence across Afghanistan. Also this hour, a report on politics and rape in India. Now streaming on PBS. https://to.pbs.org/3B00pcu | FRONTLINE | PBS