Rabbi Shammai was an engineer, known for the strictness of his views. The Talmud tells that a gentile came to Shammai saying that he would convert to Judaism if Shammai could teach him the whole Torah in the time that he could stand on one foot. Shammai drove him away with a builder’s measuring stick! Hillel, on the other hand, converted the gentile by telling him, “That which is hateful to you, do not do to your neighbor. That is the whole Torah; the rest is commentary. Go and study it.”