The fifth Hourglass blog carnival on aging and longevity science draws near - remember to send in your submissions. "Hourglass is a monthly blog carnival devoted to biogerontology. Its main purpose is to provide a regular showcase for the growing number of excellent blog posts about the biology of aging. We are soliciting entries in the general subject area of aging and biogerontology: Topics of posts should have something to do with the biology of aging, broadly speaking - including fundamental research in biogerontology, age-related disease, ideas about life extension technologies, your personal experience with calorie restriction, maybe even something about the sociological implications of increased longevity. Opinions expressed are not necessarily those of the management, so feel free to subvert the dominant paradigm. If in doubt, submit anyway. ... Just about the only sorts of things we'll turn away are quackery and promotions of commercial products (including brazenly for-profit websites of no redeeming scientific value). So, no growth hormone commercials or glowing reviews of your own book, please. ... Submissions should be emailed to [hourglass.host][at][gmail][dot][com]."