Johnny Ball invites you to sit down and says Hello, Hello, Hello Today he delves into the past, present and future of communications. Did you know that from a phone you could ring world-wide to over 450 million others-provided you know the language - and to help you there are satellites 22.300 miles (36,000 km) out in space?
Meanwhile, think again about the way you communicate. How many phone calls are made every day in Great Britain - 16 million, 53 million, 65 million?**
Written by JOHNNY BALL Designer ADRIAN SMITH
Executive producer CYNTHIA FELGATE Producer ALBERT BARBER BBC Bristol
Think of a Number. £2.95. from boo/cshopj