There is no such thing as 'common sense'. Everyone learnt what they know. Genetics alone gives you a series of reflexes, some body changes and a few basic urges

There is no such thing as 'common sense'. Everyone learnt what they know. Genetics alone gives you a series of reflexes, some body changes and a few basic urges. Everything else was learnt somewhere, somehow and at some time. The only 'common' part is where you learn something or experience something in much the same way as someone else. We do not all share the same collective experiences.