In just a few years' time, experts say that billions of machines will be connected to…

In just a few years' time, experts say that billions of machines will be connected to each other and to the Internet. As a consequence, computers will increasingly run our lives for us. For example, your fridge will know when you need more milk and add it to your online shopping list; your windows will close if it is likely to rain; and your watch will record your heart rate and email your doctor.