The most powerful things can be the most dangerous one.
This thought stuck my mind from the example of Internet, while teaching students, I've mentioned many times make use of internet, it is the greatest invention of the mankind, it has made our world smaller and information quick access on our finger tips. However, Internet can also turn out to be the most dangerous place where a naive,innocent and people un-aware things like phishing, or identity theft etc. It is easy for someone to fall victim no matter how advanced Internet browsing application (such as firefox, chrome, opera or IE) has become.