药逢气类方成象，道在希夷合自然。
药物遇到同类之气才能成形，大道在虚无缥缈中与自然相合。
The only constant is change, continuing change, inevitable change, that is the dominant factor in society today. No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be.
The application of drones will be ubiquitous.
The only valid data for psychology are the reports of trained observers.