$Novo Nordisk AS(NVO.US)Let's talk about risk: In nature, risk often refers to being preyed upon, infected by diseases, etc. In human society, risk often refers to bankruptcy, crime leading to imprisonment, etc. In the investment world, risk often refers to stock losses, etc. All of the above have one thing in common, which is the loss of "capital". In nature, capital is life; in human society, capital is social status; in the investment world, capital is money. Personally, I think the risk of investing in stocks lies in the probability of losing capital in this investment. Or, how likely is it that this company will be eliminated and eventually go bankrupt? Perhaps this is what Buffett meant by "Rule No.1: Never lose money. Rule No.2: Never forget Rule No.1."