Car exhaust fumes pollute our cities and damage our lungs – but tiny bits of car tires when we screech to a lot, or which come over with wear and tear? It was assumed by the scientific community that these bits of plastic end up on the side of the round or down the storm pipe, but it turns out we are eating more synthetic materials that we want to know.  A recent study from the University of Vienna found that lettuce easily and quickly takes up runner bits when growing and we ingest them in our salads. Although natural rubber is the made material used in tires, there are…