Family links with 18th century scientist.
Both people in the pictures on the left can claim family links to 18th century scientist Joseph Priestley.
Margaret Ware and Priestley Toulmin met for the first time at Huddersfield University during a conference to celebrate the man who identified oxygen.
Mrs Ware, in her 60s, is his great-great-great-great-great- niece.
Dr Toulmin, a 74-year-old geologist from the USA, is his great-great-great-great- grandson.
They teamed up at an event which marked the 200th anniversary of the death of Birstall-born Priestley.
He grew up in Heckmondwike and later had to flee Britain because of his religious and political beliefs.
Priestley fled to America in 1793 and founded the Unitarian Church there.