Anonymous

For David Goggins, childhood was a nightmare--poverty, prejudice, and physical abuse colored his days and haunted his nights. But through self-discipline, mental toughness, and hard work, Goggins transformed himself from a depressed, overweight young man with no future into a US Armed Forces icon and one of the world's top endurance athletes. The only man in history to complete elite training as a Navy SEAL, Army Ranger, and Air Force tactical air controller, he went on to set records in numerous endurance events.

From the 17th century to the 21st century, humans went from being almost universally agrarian with sailing vessels, muskets, and astrolabes being the most cutting-edge technology on the planet, to an era where the world is almost universally industrial or post-industrial with airplanes, cars, spaceships, computers, widespread electricity, and the ability to produce much more food than was ever possible before the Industrial Revolution.