People are born with the knowledge that Latin is spoken in Rome in today's society (common knowledge), but they are not born with the knowledge of roman numerals (not common knowledge)
A small piece of information. Derived from the word ken, used often in the scottish language and is synonymous with knowledge.
Person 1: "Hey I don't get this shit. How do you solve this problem?"
Person 2: "I got that one. Give me some kenlets on this assignment and I'll help you w/ that one."