Jehovah's Witnesses refuse blood transfusions, which they consider a violation of God's law based on their interpretation of Acts 15:28, 29 and other scriptures. Since 1961 the willing acceptance of a blood transfusion by an unrepentant member has been grounds for expulsion from the religion. Members are directed to refuse blood transfusions, even in "a life-or-death situation". Jehovah's Witnesses accept non-blood alternatives and other medical procedures in lieu of blood transfusions, and their literature provides information about non-blood medical procedures.
What biblical passage informs Jehovah Witnesses' refusal of blood transfusions?
Acts 15:28, 29

In Classical Antiquity, the inquiry into the workings of the universe took place both in investigations aimed at such practical goals as establishing a reliable calendar or determining how to cure a variety of illnesses and in those abstract investigations known as natural philosophy. The ancient people who are considered the first scientists may have thought of themselves as natural philosophers, as practitioners of a skilled profession (for example, physicians), or as followers of a religious tradition (for example, temple healers).
What is an example of skilled professionals?
physicians

The Mongol prince Godan, a grandson of Genghis Khan, raided as far as Lhasa. During his attack in 1240, Prince Godan summoned Sakya Pandita (11821251), leader of the Sakya school of Tibetan Buddhism, to his court in what is now Gansu in Western China. With Sakya Pandita's submission to Godan in 1247, Tibet was officially incorporated into the Mongol Empire during the regency of Toregene Khatun (12411246). Michael C. van Walt van Praag writes that Godan granted Sakya Pandita temporal authority over a still politically fragmented Tibet, stating that "this investiture had little real impact" but it was significant in that it established the unique "Priest-Patron" relationship between the Mongols and the Sakya lamas.
Who was the Mongol prince?
Godan