truth context
in a scientific context there are no facts. there are only theories. in an engineering context, a set of those theories are assumed to be facts within the domain to which they are applied. like thermodynamics, fluid mechanics, electromagnetism, relativity, newtonian mechanics, evolution, etc. from those assumptions, engineers build bridges, cars, and airplanes. some scientific theories aren't appropriate for engineering use yet. should we build a bridge on string theory? nope. should we build a car based on common descent? absolutely. should we build an airplane on inflation? maybe. remember this the next time you hear some fool yappin' about scientific facts. regardless of whether he's pro-science or not.