11.   The scientists have used a model to test the technology, which was an official secret until recently.

12.   Scientists use experiments, especially those which can be carried in a laboratory or under controlled conditions to simplify these interactions.

13.   American scientists used a trick evolved by a bacterium that can survive for centuries without water.

14.   Another method scientists use to infer geological history is to measure the ratio of a radioactive form of argon to a nonradioactive form.

15.   As the field of genomics progresses, the report said, scientists will increasingly use computer-aided systems with extensive databases of chemical information.

16.   ----- Can scientists use the existing stem cells?

17.   A scientist in one place makes a discovery and finds a cure for a virus, and then later another scientist uses his discovery to heal something else.

18.   Academic and government scientists can use the gene data to produce varieties of rice without having to pay royalties.

19.   After the Cold War, in a first, the Navy agreed to let civilian scientists regularly use its fleet of nuclear attack submarines to study the Arctic.

20.   After eggs and sperm are collected, laboratory scientists use hollow needles to puncture one egg at a time and inject each with a single sperm.