My video today was prompted by a fascinating NOVA Documentary: Life's Rocky Start. A University of Wisconsin geologist is featured.
"What is the secret link between rocks and minerals, and every living thing on Earth? Four and a half billion years ago, the young Earth was a hellish place—a seething chaos of meteorite impacts, volcanoes belching noxious gases, and lightning flashing through a thin, torrid atmosphere. Then, in a process that has puzzled scientists for decades, life emerged. But how?"