21.   Researchers are testing some drugs in clinical trials.

22.   Researchers have been testing this product to prevent heat exhaustion in firefighters.

23.   Researchers are now testing a magnetic scanner that creates a strange quantum link between atomic nuclei in different parts of the body.

24.   Researchers tested several unsuspecting rabbits with this new product.

25.   Researchers tested the water, the walls for radiation, the soil, even a microwave tower outside.

26.   Researchers will test air cleaners this year.

27.   Researchers are also testing a pure, synthesized version of secretin.

28.   Researchers are testing both conditions.

29.   So far the researchers have tested one and two injections.

30.   So although many researchers had tested muscle performance in the lab, nobody had ever put muscles to use in a robot.