And by using people rather than experimental animals for the tests, the researchers can be confident that the results are applicable to humans.

ECONOMIST: Monitor

Dr de Grey's ideas, which are informed by literature surveys rather than experimental work, have been greeted with scorn by those working at developing such repair kits.

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It all looked experimental rather than strategic.

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He made imaginative leaps and discerned great principles through thought experiments rather than by methodical inductions based on experimental data.

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