<span>The Tuskegee Airmen were the first African American soldiers to successfully complete their training and enter the Army Air Corps (Army Air Forces). Almost 1,000 aviators were produced as America's first African American military pilots</span>
researchers can use that decay as a kind of clock that allows them to peer into the past and determine absolute dates for everything from wood to food, pollen, poop, and even dead animals and humans.
Goods that had once been painstakingly crafted by hand started to be produced in mass quantities by machines in factories, thanks to the introduction of new machines and techniques in textiles, iron making and other industries
