If the future's electric, why isn't the past? Think a little bit about that simple-sounding question and you'll understand what science is all about and why it matters so much to humankind. Consider this: the ancient Greeks knew some basic things about electricity over 2500 years ago, yet they didn't have electric cookers or fridges, computers or vacuum cleaners. How come? Electricity is just the same as it was back then: it works in exactly the same way. What's changed is that we understand how it works now and we've figured out effective ways to use it for our own...