When considering a problem, that problem is in and of itself always some sort of constraint of something, and in order to solve the problem and break apart the constraint one must use one's mind and wield one's ability to think outside of the box. Far too many minds are trapped within the box. Don't listen to them! They might say things like: "Well, if it was needed, some guy would have made it already." This is not true, because you just might be that guy, so when faced with the problem and the constraint, don't put any further constraints on the only weapon you have for solving it: Your mind. Be childlike. When your mind is unrestrained, it becomes the most powerful force for innovation in the universe!
Once the small and strong internal combustion engine was created, it took humans less than 40 years to develop air planes. It took evolution millions of years to develop flying creatures. Why? Because innovative people refused to have their minds being restrained!