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Most control structures use a test expression that executes either selection (as in the: if then else) or iteration (as in the while; do while; or for loops) based on the truthfulness or falseness of the expression. Thus, we often talk about the Boolean expression that is controlling the structure. Within many programming languages, this expression must be a Boolean expression and is governed by a tight set of rules. However, in C++ every data type can be used as a Boolean expression because the value of any data type within C++ can be demoted into a Boolean value.

The first-year students averaged 52 minutes per day on social networks such as Facebook. On average, they sent between 11 and 20 text messages per day and spent 45 minutes texting or talking on a cell phone. Most students had between 150 and 200 Facebook friends.

More significantly, Jacobsen’s analysis reveals that Facebook and cell phones facilitated face-to-face interactions for this group of students. Initially the researchers suspected that digital media would partially replace offline socializing. Instead they found that face time increased by 10 to 15 minutes for every hour spent with social media and cell phones.

The strength of currencies has become a source of tension between some of the world's biggest economies, especially the US and China. Brazil's finance minister went as far as to warn that his country would not stand idly by as international currency wars threatened its competitiveness. What was he talking about? Watch this animated guide to find out about why countries are falling out with each other because of their currencies.