Aeronautical engineers have speculated over the years that a bumble-bee is incapable of flight. We are unable to figure out how bumble-bees generate enough lift, their bodies are too large for the wingspan. Yet we know that bumble-bees can and do fly. While we have struggled with the physics of it, the bumble-bees have just gotten on with doing what they do. Do you suppose if they understood that they should have difficulty flying, that they would? Please don't tell them.