When I was young, the municipal bus system was called the RTD. Officially, the acronym stood for Rapid Transit District, but to Angelenos who lived in hellholes like Watts, La Puente, and South Central, too young or too poor to drive, it stood for Rough Tough and Dangerous. My first scientific paper, written at age seven, was “Passenger Seating Tendencies by Race and Gender: Controlling for Class, Age, Crowdedness, and Body Odor.” The conclusion was readily obvious. If forced to sit next to someone, people violated the personal space of women first and black people last. If you were a black male, then no one, including other black males, sat next to you unless they absolutely had to.