Bruno was a mathematician, philosopher, astronomer, occultist, and according to the Catholic church of 16th-century Italy, a heretic. He met a bad end because of his views, but he started out as a friar.
Research:

SYMHC Classics: Hennig Brand
29:33

Behind the Scenes Minis: Odd Baby Train
28:32

George Stephenson, Father of Railways
44:09