Scientists have identified a molecule in the brain that may help to protect the body from anxiety, and could help explain people’s use of marijuana in times of stress. In a study conducted in mice and published in Neuron, researchers looked at the molecule 2-arachidonoylglycerol (2-AG). This molecule is involved in a connection between the amygdala and frontal cortex. These parts of the brain are responsible for regulating emotions, memory and empathy, among other things…