Photo Source: Pixabay About the time Heitor Mendes turned 40, for reasons no doctor could explain, he developed a sensitivity to signs. At first, he reacted to each sign he passed with disgust. That increased to him reading the sign orally, then saying, “No!” Finally, his discomfort became so intense that whatever a sign told him to do, he did the opposite. If he saw a STOP sign, he sped up. He particularly hated STOP signs that featured an upraised open palm in place of the O. For...