11.55 Ecology: Grasses and Agriculture The use of fertilisers and herbicides has had a dramatic effect on the natural balance of the ecosystem.
12.20* Members of the Jury
How does a jury reach its decision?
12.45* Teaching by Telephone imagine a class of students without a tutor at the front. A ' remote blackboard ' and loudspeaker telephones connect them to another class 50 miles away.