63 in water 100/g KNO3 Potassium nitrate
Frontal lobe because its where decisions are made and behaviors are choices (in most cases).
Most people affected would live in China: 43 million or around 20 percent. At 32 million and 27 million affected people, Bangladesh and India would also be hit hard, as would be Vietnam, Indonesia, Thailand, the Philippines and Japan. In Europe, the Netherlands would theoretically be the most affected.
Large bodies of water or ocean currents.