Murphy's Law

"Anything that can go wrong, will go wrong". From an inventor's viewpoint, this is ultimately an argument for keeping things simple and focused on a single task. The simpler an invention is, the less scenarios need to be considered and tested. Another way to understand it is as though you are living in the future looking back at a problem that occurred: "If something went wrong with your invention, it's because you didn't do anything to prevent that scenario from happening". Examples of things you could have prevented but didn't, and thus went wrong: - The electrical cables burned the house down because the load was too hot. This could have been prevented by adding a fuse, but you didn't. - The water heater exploded because it didn't have a pressure release valve, which it could have had, but didn't. - The door fell off the plane when it went upside down because the hinge pin didn't have a lock, which it could have had, but didn't. - The Earth shifted and caused cracks in the clay pipes under the house, which could have been prevented if flexible piping was used, but it wasn't. Again, ultimately this is a reminder to keep your invention as simple as possible. It's often tempting to keep throwing new features into it, to make it appeal to a larger audience or solve more problems, but every new feature creates new, untested possible outcomes which can be hard to predict. Hard to predict that is, until they've happened, which they will.