[Equivocal quintessence. Spiritual alchemy and counterfeit money in 16th-century Spain]. / Equívoca quintaesencia. Alquimia espiritual y moneda falsa en la España del siglo XVI.

One of the main obsessions of the early modern era was that of determining the notions of true and false, in order to apply them to various fields of knowledge and thus establish the divide between the lawful and unlawful. This trend was to have a particular impact on the fields of religion and science, where it became necessary to distinguish not only between true and false spirits, relics or miracles, but also between genuine and fake astrologers and alchemists. Situated in the middle ground between idealism and materialism, alchemy was prime territory for such tensions, as was demonstrated by a trial held in 1593 at the Jeronymite monastery of Santa Enracia in Saragossa, whose prior accused a friar of making "silver out of smoke and jewels from goblins".

Epidemiology of Medicare abuse: the example of power wheelchairs.

OBJECTIVES: To determine the effect of neighborhood ethnic composition on power wheelchair prescriptions. DESIGN: The 5% noncancer sample of Medicare recipients in the Surveillance, Epidemiology and End Results (SEER)-Medicare linked database, from 1994 to 2001. SETTING: SEER regions. PARTICIPANTS: Individuals covered by Medicare living in SEER regions without a cancer diagnosis. MEASUREMENTS: Individual characteristics (age, sex, ethnicity, justifying diagnosis, and comorbidity), primary diagnoses, neighborhood characteristics (percentage black, percentage Hispanic, percentage with <12 years education, and median income), and SEER region. RESULTS: The rate of power wheelchair prescriptions was 33 times greater in 2001 than in 1994, with a shift over time from justifying diagnoses more closely tied to mobility impairment, such as strokes, to less-specific medical diagnoses, such as osteoarthritis. In multilevel, multivariate analyses, individuals living in neighborhoods with higher percentages of blacks or Hispanics were more likely to receive power wheelchairs (odds ratios=1.09 for each 10% increase in black residents and 1.23 for each 10% increase in Hispanic residents) after controlling for ethnicity and other characteristics at the individual level. CONCLUSION: These results support allegations that marketers promoting power wheelchairs have specifically targeted minority neighborhoods.