Aunilateral do not attempt resuscitation (DNAR) order iswritten by a physician without permission or assent from the patient or the patient’s surrogate decision-maker. Potential justifications for the use of DNAR orders in pediatrics include the belief that attempted resuscitation offers no benefit to the patient or that the burdens would far outweigh the potential benefits. Another considerati...

Despite 180 years of theory on magnetism, it appears that the practice of calculating forces on magnetic media is ambiguous, as illustrated by a recent article by Casperson [1]. Potentially troubling issues include: Which field B or H should be used? Should the total field be used, or only the external field? And if the latter, what is meant by “external”? Can/should effects of magnetization cu...

The notion that the colon's deep crypt pockets provide a protected location that shields stem cells from potentially toxic substances is widely accepted. In this issue of Cell, Kaiko et al. reveal how a metabolite abundantly produced by the gut microbiota can inhibit stem cell proliferation but is blocked from doing so by crypt architecture.

Editor: STANFORD WESSLER, M.D.