Catalysts
Catalysts are substances that have the ability to accelerate specific chemical reactions without undergoing any internal change. Nearly every business we deal with on a daily basis uses them, including the production of beer, home construction, and daily cookery. Since Ancient Egypt, for instance, yeast has been utilized to quicken baking procedures.
Although catalysts are a necessary component of life, scientists are still unsure of how they function. Since there are millions of conceivable combinations, we actually model all the physical, mathematical, and chemical processes needed to create an efficient catalyst for a specific reaction using supercomputers. We simply don't understand them well enough to be able to create one on demand, so we have to use more "try and error" methods to do it.