Eating clay, drinking urine, applying honey to deep wounds and mere plaster to crushed these are all folk remedies for ailments, passed on through the generations and thoroughly discounted by modern science. It is too bad, write scientist-historian couple Robert and Michèle Root-Bernstein, who deplore the loss of proven methods developed without the blessing of the academy, noting that 'formal academic systems are only one of many ways in which knowledge is discovered, accumulated, and transmitted.' Many scientists are now coming to agree with this view, they write in this fascinating collection of case studies. Researchers have showed that black tea, for instance, has powerful antibiotic properties and that maggots do an extraordinary job of cleaning wounds—as traditional healers have known all along.