Any benzodiazepines, like clonazepam (Klonopin), diazepam (Valium), midazolam (Versed). Also GABA analogs like Gabapentin (Neurontin) and Pregabalin (Lyrica).
The spread of Islam from Mecca to all the other countries around it.That's an example because Contagious Diffusion is The distance-controlled spreading of an idea, innovation, or some other item...