21.   Since the first experiment with Metrocard four years ago, it has been slow to catch on with riders.

22.   That question is being explored in animals, and in tissue cultures, Lane says, and the first experiments are under way in humans with arthritis.

23.   That was nine months into the first experiment, run by the controversial and now-defunct Space Biosphere Ventures.

24.   The first experiments by Berg and Block were with bacteria, which propel themselves through liquids by twisting their tails.

25.   The first experiments using a similar material on human cancer patients may be less than two years away, they said.

26.   The first experiment involved dropping a fruitcake from the roof of a two-story building onto a concrete basketball court.

27.   The first experiment, she said, was confined to the Hunts Point area of the Bronx.

28.   The first fire experiments of the space age were conducted in drop towers that artificially create a few seconds of weightlessness on platforms that fall like runaway elevators.

29.   The Lukoil venture comes about two months after the first U.S. experiment in Russian stations came to an end.

30.   The two men ventured outide the station for the first time on Thursday to install a large coolant storage tank and the first external experiments.