Many things have changed for humans since their early days as a species—how excited do you think early Homo sapiens would have been by heating, air conditioning and weather tight structures to install them in, for example?

Not everything is different, however. We still have fundamentally the same brains as the first creatures we would recognize as “one of us.” That means we process and respond to the basic sensory inputs we see, hear, feel, taste, and smell today as our earliest human ancestors did….