> Even just defining "think" sounds hard to me. Well, to 'think' in the OP's article context means to think about. Think about fish, it swims, think about cars

> Even just defining "think" sounds hard to me. Well, to 'think' in the OP's article context means to think about. Think about fish, it swims, think about cars, it moves. The replies are more about 'information processing' and 'innovative reasoning'. So people often can not find the correct word for an abstract idea. The human brain stores a huge namespace of world view and knowledge, sometimes the natural languages are not enough to decode and describe its complexity.