1.   As in the study of domestic politics, political scientists use models as aids to understanding.

2.   Firemen found more than a dozen incendiary devices in the offices near Borden, Hants, used by scientists to study squirrels.

3.   Inevitably, the scientists used some of the same ingenuity they brought to building the bomb to improving their high-desert outpost.

4.   Scientists use computers to help analyse the data.

5.   Scientists use the data to infer the distances to similar, but much more distant stars.

6.   Scientists used to think of mutations as rare events.

7.   Scientists have used genetic engineering to protect tomatoes against the effects of freezing.

8.   Scientists use various techniques to date fossils.

9.   Since then, other scientists have used embryos to clone cattle, pigs, goats, rabbits - and, now, even monkeys.

10.   The report says that the methods used by scientists at the Department of the Environment to calculate future acid rain damage are flawed.