Sin is what we call the committed action of any bad deed or evil thing that someone does to something or someone else in such a way that it completely overshadows all moral right. Of everyone else who strives to be a better person. Science cannot prove literally anything. The way the brain is constructed is just as complicated as the concept of right and wrong. Right being good(righteousness) and wrong being evil(sin). Our emotions can lead to each side depending on how we as humans follow them. It all depends on how we feel about them.
Sin can be found in the real world at every turn. For instance, individuals are unfaithful to their significant others all the time. People commit crimes and make other human beings their victims every moment of the day. Sin might be a religious institution, but sin does occur around the world and with great frequency.
Sin is a biblical term used by Judeo-Christian religions to describe acts that offend God. It is strictly a term that refers to an act. It is not the act itself. While the Judeo-Christian basis for sin has played a large role in determining societal values, whether or not one can actually commit a sin is subjective to the religious practices of people. Sin, therefore, is a not a universal secular concept.