There is a new field of study called neurogastronomy and it is now known that when you sit down in your favorite fast food joint and savor the delicious aroma of your Big Mac and fries or your chicken McNuggets or your KFC hot and spicy what actually happens is that a certain gene is expressed in the odor receptors in your nose and it is precisely this genetic process which stimulates your taste buds and makes you want to wolf it all down. When the gene is expressed (and there is a specific gene for every conceivable taste and smell) it synthesizes a protein in one or some of the 350 odor receptors in your nose and it is this protein (and not the actual smell) which generates electrical signals that are transmitted to the olfactory cortex in your brain and causes the neurons to synapse that eventually allow you to become conscious of smelling this delicious food. There is an “odor barcode” in the DNA that literally tells you what that food you are eating smells and tastes like.
An article in New Scientist (10/24/15) heralds the end of physics as we know it. What’s at stake here is Einstein’s theory of General Relativity. The article is entitled “Could cosmic megastructures be intruders from another world?” and is an attempt to get around the problem that General Relativity is defunct by arguing that all these megastructures that shouldn’t be there according to General Relativity, are not actually in this universe at all, but in fact are “illusory” and are windows into “other dimensions” or into “parallel universes.”
Einstein’s theory of General Relativity is a complex mathematical theory about the curvature of space-time. He adapted the Riemann curvature equations which were intended to measure the curvature of objects in 2-D and 3-D spaces and simply plugged a fourth dimension of time into these equations. The answers that emerge from these equations cannot actually be envisaged by us in our 3-D world view and Einstein himself was the first to admit that these calculations have no “physical” significance.