Writing and Speaking

6 Write two advantages and two disadvantages of using optical fibres instead of copper cable. Compare your ideas with the rest of the class.

Get real

Use the Internet, magazines, or newspapers to find out about another interesting invention of the last twenty years. Try to find out two advantages and two disadvantages of the invention and tell your class. Decide who found out about the most interesting invention.

16 Engineering

Big is best

Before you start

1 Work in pairs. You have one
minute. How many different
dams or tunnels can you
think of? Compare your
answers with the rest of the
class.