11.   All of the men were eventually stricken with illnesses that scientists have linked to asbestos exposure, from various cancers to pleural thickening and scarring of the lungs.

12.   Experts said it is the first time scientists have linked secondhand smoke to genetic mutations in a fetus.

13.   In a study released Wednesday, British scientists linked the molecular pattern of mad cow disease with Creutzfeld-Jakob Disease, a fatal brain disease in humans.

14.   Scientists link the cattle disease with the human version of a brain-wasting ailment, new variant Creutzfeldt-Jakob disease.

15.   Scientists have linked carbon dioxide pollution with the phenomenon of global warming.

16.   Scientists have linked emissions from air conditioners with CFCs to a withering of the stratospheric ozone layer, which shields the Earth from ultraviolet radiation.

17.   Scientists have linked mad cow disease to variant Creutzfeldt-Jakob disease, which affects humans.

18.   Such animal feed is believed to be the main conduit for BSE, which scientists have linked to a similar brain-wasting disease in humans.

19.   Some scientists have linked BSE to the deadly human malady, Creutzfeldt-Jakob disease.

20.   Such animal feed is believed to be the main conduit for the disease, which scientists have linked to a similar brain-wasting disease in humans.