I am the author, with Svetlana Isakova, of Atomic Kotlin.I suspect most people currently alive were introduced to the concept of zero quite early in their development—early enough that they internalized it as a foundational principle and don’t ask questions about it. In addition, many people probably know that zero was invented after the original number systems.The ancient Greeks didn’t have a zero, and it puzzled them: “How can nothing be something?