21.   Leading scientists are stepping into the fray.

22.   Leading scientists estimate that aircraft emissions could have more than half the global-warming potential of emissions from road transport.

23.   Leading scientists from both universities, including Dr. David Baltimore, president of Caltech, were among the speakers at the inauguration.

24.   Leading scientists note, however, that once they produce such an embryo cell, by cloning, that cell need not become a new human being.

25.   Leading scientists and archaeologists say the damage to human science will be incalculable.

26.   Leading scientists and government officials said Gelsinger was the only person known to have died as a direct result of receiving gene therapy.

27.   Leading scientists say another avalanche of change is under way, opening the new century with a wholly new kind of medicine for an aging world.

28.   Leading scientists have criticized him for wasting time on discredited theories while South Africa is suffering one of the highest HIV infection rates in the world.

29.   Leading scientists think this new field with the funny name could be the next big thing in biotechnology.

30.   Machover witnessed a shouting match between a leading scientist and the visionary composer Karlheinz Stockhausen.