A cipher is a code used to protect information that is being stored or communicated, so that only people who are allowed to can access it. With this fun challenge, brought to you in partnership with ...

When my son, Ian, was 3, I bought him a cellphone. It had three buttons: "Call Mom," "Call Dad" and "Call Grandma." He was young, but it helped us feel better he could reach us in case of an emergency ...