A human is a biological concept, whereas a person is a social and cultural concept. While "humans" are most often referring to the Homo sapiens species, "people" refers to the idea of humanity as a collective, faceless crowd rather than something to be studied. To describe a human means to evoke the notion of the animal form, the flesh and blood. Human anatomy is purely scientific; a human has lungs, skin, and fingernails. A human is a physical thing and is fundamentally distinguishable from machines. Referencing a person, on the other hand, calls forth ideas of an average human in society, an individual who is undoubtedly human but additionally lives within society, forms relationships, pays bills, sprains their ankle, and engages in "mundane" human activities. Machines, of course, are not permitted to perform any of these activites. Therefore I believe that while the terms "human" and "person" are interchangeable to some humans, it is imperative to understand that each word carries a certain distinct weight.