Discoverer of carbon dating

Priestley later wrote that the book that influenced him the most, save the Bible, was David Hartley's Observations on Man (1749).

Hartley's psychological, philosophical, and theological treatise postulated a material theory of mind.

He was the oldest of six children born to Mary Swift and Jonas Priestley, a finisher of cloth.

To ease his mother's burdens, Priestley was sent to live with his grandfather around the age of one.

He spent his last ten years in Northumberland County, Pennsylvania.

A scholar and teacher throughout his life, Priestley also made significant contributions to pedagogy, including the publication of a seminal work on English grammar and books on history, and he prepared some of the most influential early timelines.

It is a component of all proteins, making it essential for life, and it is also found in various minerals.

He has historically been credited with the discovery of oxygen, During his lifetime, Priestley's considerable scientific reputation rested on his invention of soda water, his writings on electricity, and his discovery of several "airs" (gases), the most famous being what Priestley dubbed "dephlogisticated air" (oxygen).

13 March] 1733 – 6 February 1804) was an 18th-century English Separatist theologian, natural philosopher, chemist, innovative grammarian, multi-subject educator, and liberal political theorist who published over 150 works.

Although Priestley's aunt had promised her support if he became a minister, she refused any further assistance when she realised he was no longer a Calvinist.

To earn extra money, Priestley proposed opening a school, but local families informed him that they would refuse to send their children.

Priestley yearned for urban life and theological debate, whereas Needham Market was a small, rural town with a congregation wedded to tradition.

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