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Cheap grinders cost less but might wear out sooner, while premium grinders last longer and work more smoothly

Companies offer a range of herbal cigarettes, which are typically made from a blend of herbs and botanicals, free from tobacco and nicotine

In 2011, researchers showed that applying a thin layer of glycerine emollient containing nanoparticles of either calcium carbonate or calcium phosphate on an isolated piece of pig skin (in vitro) and on the skin of mice (in vivo) prevents the penetration of nickel ions into the skin

This column by George Johnson is an update of an "On Science" column that ran in June 1998 in the St