Between May 2011 and June 2012 I used to send daily mailers to my office team.I used to ask one puzzle, riddle, mathematics question which they had to answer by the end of the day. Those who used to answer had their names in the list that I used to send with the answer of that question.
It was an interesting routine. Some people used to wait for this mailer. It was fun !
I even treated a girl with coffee who solved the birthday paradox successfully.
It was called perestroika for not a particular reason. I like glasnost and perestroika. Perestroika etymologically means reforms.Though this email was not reforming the lives of anyone but was at least introducing a new element ,a new variable to the lives of many people who were open to it.