Where's my hoverboard? And other movie tech we want now

Bill & Ted's time-travelling phone booth
Bored with modern day life? Why not hop into a time machine and transport yourself to another era? Dodge dinosaurs in the morning, then surf the Circuits of Time into the future to check out the iPhone nano -- after a spot of lunch in Renaissance Rome.

Where the hell is it?
The concept of time travel is widely used in films and literature, but is considered impossible by modern science. According to Einstein's theory of relativity you'd need to travel faster than the speed of light in order to travel through time, but nothing with a mass can do that.

I want one now!
If you've got an urgent hankering to relive your past, however, you can always put on your old school uniform and head down to a School Disco. After several drinks you might even believe you've travelled back in time. If you're too young to buy alcohol, museums are brilliant.