Letters to the Editor

19507

Titan may represent conditions that existed on Earth when life arose. One important difference is the extremely cold temperature on Titan. However, the known life cycle of stars predicts that, at some time in the far distant future, our sun will gradually expand. As that happens, Titan will heat up, and that may be sufficient […]

19506

This article attributes behaviors of earlier bedtime, longer sleeping, and earlier weaning to “greater personal independence” in children who sleep alone. It is equally possible that these behaviors are due to something else. Research predicting which children and families will benefit from co-sleeping or alone sleeping would be more useful. Heather Kuiper and Loren RauchOakland, […]

19505

Your article reports that left brain areas normally associated with language comprehension are activated in shepherds who communicate in a whistled language.